Morgan Territory Regional Preserve Weather
Park • San Francisco Bay Area
High on the sandstone hills east of Mount Diablo, Morgan Territory Regional Preserve covers more than 5,300 acres of grassland and oak woodland. Only a narrow, winding road from Livermore or Clayton reaches it. The East Bay Regional Park District manages it as a land bridge between Mount Diablo State Park and Round Valley. The main staging area sits on a pass at about 2,000 feet. From the ridgetops the views run to Mount Diablo, Mount St. Helena, and the Sierra Nevada.
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Hourly Forecast
Current Conditions
Comfort Breakdown
Morgan Territory Regional Preserve weather today and through the year
It's 48°F at Morgan Territory Regional Preserve right now (feels like 41°F), with 12 mph wind and a comfort score of 61. Today's forecast high at Morgan Territory Regional Preserve is 55°F, 6°F below the mid November normal of 61°F. Fog is forecast to linger into the afternoon today at Morgan Territory Regional Preserve. In November, fog here usually thins by 1 PM. The best window today is 8 AM to 11 AM, at about 49°F with a 13 mph wind (comfort 55).
July is the warmest month at Morgan Territory Regional Preserve, with an average high of 85°F. December is the coldest, with an average low of 41°F. January is the wettest month (4.1 in.), out of about 20.9 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Morgan Territory Regional Preserve are September, August, and June. The best hours are usually 11 AM to 2 PM in September, 9 AM to noon in August, and 11 AM to 2 PM in June.
At around 2,000 feet, Morgan Territory sits above the cool marine air that settles into the Livermore and Diablo valleys on summer nights. That layering is called an inversion, because the air gets warmer with height instead of cooler. A climate study of the Livermore Valley wine region found it often leaves sites above 1,000 feet warmer, on average, than the valleys below. Summer nights up here can be milder than in Livermore or Clayton, while afternoons on the exposed ridges are hot.
Forecast updated November 15, 2026 at 4:00 AM PST. Climate figures come from NOAA 1991-2020 normals. Hourly patterns come from NOAA's HRRR hourly analysis from September 2014 to April 2026.
What to expect at Morgan Territory Regional Preserve in the next few days
No active National Weather Service alerts for this location.
Fog
Fog is forecast to linger into the afternoon today at Morgan Territory Regional Preserve. In November, fog here usually thins by 1 PM.
Best time to go
The best window today is 8 AM to 11 AM, at about 49°F with a 13 mph wind (comfort 55).
Hiking conditions
Best hiking day this week: Friday, with 9 daylight hours that are dry, 45 to 80°F, and under 18 mph wind. 3 of the next 7 days have at least 4 such hours.
Best day this week
Of the next 7 days, Friday looks best for Morgan Territory Regional Preserve, with a 54°F high and midday comfort near 69. Wednesday looks weakest (33).
Rain
Next good chance of rain: today (78%, about 0.11 in.).
Live weather map
Weather around Morgan Territory Regional Preserve right now
Overcast and 48° at Morgan Territory Regional Preserve right now.
About the live weather map for Morgan Territory Regional Preserve
The map centers on Morgan Territory Regional Preserve and stacks fog, satellite clouds, and precipitation radar on one view. Clouds come from the GOES-West satellite and rain from NOAA radar, and both show current conditions. Fog comes from our HRRR-based fog model, and the slider steps through its forecast for the next 12 hours.
Dots mark nearby places with their current temperature, colored by comfort score. Use the layer buttons to turn any layer off, or open the full map for every destination in the region.
Nearby Temperature Comparison
Conditions at nearby San Francisco Bay Area destinations
Tip: Bay Area temperatures can change by 20 to 30°F over a short distance because of microclimates.
Morgan Territory Regional Preserve vs nearby places
Typical summer conditions compared with Morgan Territory Regional Preserve, from the same NOAA HRRR hourly record. The list shows the closest places, then nearby places whose climate differs the most.
| Place | Distance | Summer afternoons | Morning fog | Afternoon wind | Compared with Morgan Territory Regional Preserve |
|---|---|---|---|---|---|
| Mount Diablo State Park | 7.8 mi | -2°F | 4% | 10 mph | 1,806 ft higher |
| Livermore | 9.5 mi | +7°F | 6% | 8 mph | about 7°F warmer on summer afternoons and 1,554 ft lower |
| Brentwood | 9.6 mi | +13°F | 0% | 8 mph | about 13°F warmer on summer afternoons and 1,958 ft lower |
| Redwood Regional Park | 20.4 mi | -7°F | 53% | 10 mph | more summer morning fog (53% vs 11% of morning hours) and about 7°F cooler on summer afternoons |
| Montclair | 22.6 mi | -8°F | 53% | 8 mph | more summer morning fog (53% vs 11% of morning hours) and about 8°F cooler on summer afternoons |
| Claremont District | 24.3 mi | -9°F | 56% | 9 mph | more summer morning fog (56% vs 11% of morning hours) and about 9°F cooler on summer afternoons |
Places with a climate like Morgan Territory Regional Preserve's
- Sunol Regional Wilderness (21 mi away): similar temperatures through the year
- Henry W. Coe State Park (46 mi away): similar temperatures through the year
- Las Trampas Regional Wilderness (13 mi away): similar temperatures through the year
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Morgan Territory Regional Preserve climate comparisons mean
These cards compare recent conditions at Morgan Territory Regional Preserve with the available local baseline. Temperature and year-to-date rainfall use long-term normals when available. Fog, sunshine, wind, and comfort use the matching recent or modeled baseline identified on each card.
Positive and negative differences describe how Morgan Territory Regional Preserve departs from its own usual pattern. They should not be read as a direct comparison with another city or as a forecast beyond the period shown.
Morgan Territory Regional Preserve weather by month
July is the warmest month at Morgan Territory Regional Preserve, with an average high of 85°F. December is the coldest, with an average low of 41°F. January is the wettest month (4.1 in.), out of about 20.9 in. a year. Morning fog peaks in December, when fog or low cloud covers 27% of the hours from 6 to 10 AM. July has the clearest middays, with clouds covering about 2% of the sky from 11 AM to 3 PM.
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Morgan Territory Regional Preserve are September, August, and June. The best hours are usually 11 AM to 2 PM in September, 9 AM to noon in August, and 11 AM to 2 PM in June.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 54°F | 42°F | 4.1 in | 8 | 20% | 31% | 9 mph | 9.8 h | 38 |
| Feb | 56°F | 42°F | 3.9 in | 8 | 15% | 24% | 11 mph | 10.7 h | 40 |
| Mar | 60°F | 44°F | 3.1 in | 7 | 16% | 30% | 11 mph | 11.9 h | 48 |
| Apr | 64°F | 45°F | 1.6 in | 5 | 18% | 21% | 11 mph | 13.2 h | 63 |
| May | 71°F | 50°F | 0.8 in | 4 | 22% | 14% | 13 mph | 14.2 h | 69 |
| Jun | 79°F | 56°F | 0.1 in | 2 | 10% | 4% | 12 mph | 14.8 h | 87 |
| Jul | 85°F | 61°F | 0.0 in | 0 | 11% | 2% | 12 mph | 14.5 h | 87 |
| Aug | 85°F | 61°F | 0.0 in | 1 | 14% | 3% | 11 mph | 13.6 h | 88 |
| Sep | 82°F | 59°F | 0.1 in | 1 | 12% | 8% | 10 mph | 12.3 h | 91 |
| Oct | 73°F | 54°F | 1.0 in | 4 | 9% | 12% | 9 mph | 11.1 h | 81 |
| Nov | 61°F | 46°F | 2.2 in | 6 | 13% | 20% | 8 mph | 10.0 h | 57 |
| Dec | 53°F | 41°F | 4.0 in | 8 | 27% | 31% | 9 mph | 9.6 h | 36 |
Morning fog is the share of hours from 6 to 10 AM with fog or low cloud. Midday cloud is the average from 11 AM to 3 PM, and afternoon wind is the average from 1 to 5 PM. The highlighted rows are the most comfortable months.
What makes Morgan Territory Regional Preserve's weather different
Among the 58 San Francisco Bay Area parks we track, Morgan Territory Regional Preserve has the 2nd-sunniest summer middays.
- #2of 58
sunniest summer middaysamong San Francisco Bay Area parks
When the fog burns off
29%of 8 AM hours foggy in December
Fog or low cloud covers Morgan Territory Regional Preserve in 29% of 8 AM hours in December, the foggiest month. It thins slowly and often lasts into the early afternoon. October mornings are the least foggy (9%).
When the wind picks up
4 PMwhen afternoon wind builds, May–August
From May through August, wind at Morgan Territory Regional Preserve typically builds after 4 PM. In May it peaks around 6 PM, averaging 15 mph with 50% of those hours windy, while mornings average 12 mph.
Daylight
9.6–14.8 hof daylight, Dec to Jun
Days at Morgan Territory Regional Preserve range from about 9.6 hours in December to 14.8 hours in June. In mid-June the sun sets around 8:31 PM, and in mid-December around 4:55 PM.
Seasons at Morgan Territory Regional Preserve
- Warm seasonJun 26 – Sep 25 · highs 80°F+
The warm season lasts about 3 months, from Jun 26 to Sep 25, when the average high is 80°F or warmer. Highs peak around Jul 8 at about 85°F.
- Cool seasonNov 29 – Mar 1 · highs 58°F or lower
The cool season runs from Nov 29 to Mar 1, when the average high is 58°F or lower. The coldest nights come around Dec 8, with an average low near 41°F.
- Rainy seasonNov 13 – Apr 2 · 79% of the year's rain
The rainy season runs from Nov 13 to Apr 2, when a day has at least a 20% chance of measurable rain. That stretch brings 79% of the year's rain.
The dark line marks today. Season dates come from the smoothed daily NOAA 1991-2020 normals. Counting from Oct. 1, a typical year has its first inch of rain by Nov 1 and half of its annual total by Jan 25.
Days per year and extremes (Nov 1, 2024 to Oct 31, 2026)
This record runs from Nov 1, 2024 to Oct 31, 2026. Over this record, Morgan Territory Regional Preserve averaged 16 days a year at 90°F or hotter and 1 night a year at or below freezing. It averaged 12 days a year with at least half an inch of rain and 20 afternoons with wind of 20 mph or more at 2 PM. About 70 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Jul 14, 2026 (95°F) and the coldest night was Feb 17, 2026 (32°F). The wettest day was Feb 14, 2025 (1.71 in.), and the strongest 2 PM gust was 45 mph on Feb 13, 2025.
- 16days at 90°F or hotter
- 1night at or below freezing
- 12days with ½ in. of rain or more
- 20afternoons with 20+ mph wind
- 70mornings with 3+ hours of fog or low cloud
- Hottest day95°FJul 14, 2026
- Coldest night32°FFeb 17, 2026
- Wettest day1.71 inFeb 14, 2025
- Strongest 2 PM gust45 mphFeb 13, 2025
What shapes Morgan Territory Regional Preserve's weather
Morgan Territory lies on the east flank of the Mount Diablo range. A climate study of the Livermore Valley wine region found that air moving through the area is funneled around the mountain toward the Altamont Pass. It also found average wind speeds here ran higher than in the sheltered western valleys. Expect a stiffer breeze on the ridgelines than in the hollows around the staging area, especially as marine air pushes inland on summer evenings.
Rain follows elevation in this part of the Diablo Range. The study found higher ground generally wetter. The Mount Diablo area was among the wettest spots in the region, and the hills toward Livermore and the Altamont were among the driest. Winter storms here are strong enough to wash out trails.
By late spring the grass dries out and the preserve becomes fire country. Hot, dry, windy days bring Red Flag Warnings, the Weather Service alerts for critical fire weather. The park district has closed Morgan Territory along with other inland parks during them.
Tips for visiting Morgan Territory Regional Preserve
Carry more water than you think
The park district warns that dehydration is a leading cause of injuries on the trail, and asks visitors to be ready for sudden changes in weather.
Drive Morgan Territory Road slowly
The road is narrow and curvy all the way to the staging area, which is 9.4 miles in from Marsh Creek Road on the Clayton side.
Watch the seasonal gate hours
Gates open at 8 a.m., but close as early as 5 p.m. in winter and as late as 8 p.m. from mid-April to early September.
Expect storm damage on some trails
Winter storms can wash out sections of trail here, and the park district posts any closures on its preserve page.
Leash dogs around cattle
Dogs must be leashed within 200 feet of any trail or park entrance, in parking and picnic areas, and whenever livestock is present.
Morgan Territory Regional Preserve through the seasons
- Spring (March–May)
- Spring is wildflower season, when more than 90 species bloom here. They include the Diablo sunflower, a rare plant of the East Bay hills.
- Summer (June–August)
- Summer is hot, dry, and exposed, with the highest fire danger. During a July 2024 heat wave, the park district closed Morgan Territory and about 30 other inland parks.
- Fall (September–November)
- September is still hot, and warm days can last into October. Nights at this elevation can stay milder than in the valleys below, where cool air pools.
- Winter (December–February)
- Clear air after storms brings the best views east to the snow-covered Sierra. Trails can be muddy or storm-damaged, and gates close at 5 p.m.
Activities and the weather that matters
- Hiking: Cool spring mornings during the wildflower bloom and clear winter days are best. Afternoons on the open ridges are hot in summer, so start early.
- Mountain biking: Bikes are allowed on designated trails only. Steep dirt trails turn slick after rain and dusty and hot in late summer.
- Horseback riding: Cool mornings in spring and fall suit long rides. Plan around midday heat in summer.
- Backpack camping: The backpack camp needs a reservation at least 2 business days ahead. Spring and fall nights are the most comfortable.
Official sources and current conditions
- East Bay Regional Park District: Morgan Territory
- East Bay Regional Park District: alerts and closures
- Morgan Territory map brochure (PDF)
Numbers on this page come from NOAA data. The text draws on the official sources linked above.
Historical Climate Data
Long-term weather patterns and climate data
Data sources: Recent temperatures come from NOAA URMA and recent precipitation from NOAA Stage IV. Fog, cloud, wind, humidity, and sunshine come from NOAA HRRR, and long-term baselines from NOAA 1991-2020 climate normals.
Climate Overview
Based on NOAA 30-year temperature/rain normals (1991-2020) with recent fog/sun baseline
🌟 Best Months to Visit
⚠️ Challenging Months
Monthly Breakdown
| Month | Comfort | High/Low | ☀️ Sun | 🌫️ Fog | 💧 Rain | Perfect |
|---|---|---|---|---|---|---|
| November 2024 | 76 | 54.4° / 45.7° | 6.3h | 3d | 1.8" | 15 |
| December 2024 | 68 | 55.3° / 46.2° | 5h | 10d | 4.65" | 10 |
| January 2025 | 79 | 53.2° / 43.1° | 7h | 2d | 0.13" | 20 |
| February 2025 | 69 | 52.5° / 43.9° | 6.6h | 6d | 5.59" | 10 |
| March 2025 | 74 | 53.9° / 43.1° | 8h | 7d | 1.97" | 14 |
| April 2025 | 86 | 61.4° / 47.4° | 9.8h | 10d | 0.5" | 20 |
| May 2025 | 92 | 70.4° / 51.8° | 12.5h | 2d | 0.17" | 28 |
| June 2025 | 95 | 77.1° / 58.3° | 13h | 0d | 0" | 30 |
| July 2025 | 92 | 77.7° / 58.7° | 12.5h | 4d | 0" | 29 |
| August 2025 | 93 | 83.2° / 65.1° | 11.5h | 1d | 0" | 30 |
| September 2025 | 90 | 76.9° / 61.3° | 10h | 4d | 0.32" | 27 |
| October 2025 | 85 | 65° / 53.3° | 7.9h | 4d | 2.3" | 21 |
| November 2025 | 75 | 59.3° / 48.9° | 6.5h | 13d | 3.01" | 14 |
| December 2025 | 68 | 56.3° / 46.1° | 5.2h | 12d | 2.75" | 7 |
| January 2026 | 75 | 55.5° / 47.1° | 6.8h | 4d | 3.56" | 18 |
| February 2026 | 73 | 56.3° / 47.6° | 6.9h | 6d | 5.05" | 15 |
| March 2026 | 93 | 69.2° / 57.5° | 9.8h | 1d | 0.02" | 28 |
| April 2026 | 82 | 60.4° / 46.8° | 9.3h | 7d | 3.67" | 20 |
| May 2026 | 88 | 68.5° / 52.5° | 12h | 8d | 0.34" | 23 |
| June 2026 | 93 | 77.1° / 57.6° | 12.7h | 3d | 0" | 28 |
| July 2026 | 94 | 81.8° / 63.2° | 12.4h | 0d | 0" | 30 |
| August 2026 | 93 | 84° / 66.7° | 11.3h | 1d | 0.04" | 30 |
| September 2026 | 94 | 75.5° / 57.1° | 10.6h | 3d | 0.02" | 30 |
| October 2026 | 88 | 71.2° / 59.8° | 8.4h | 2d | 0.35" | 25 |
Climate Trends
Average Temperature by Month
About the Morgan Territory Regional Preserve climate charts
The temperature chart compares average monthly highs and lows at Morgan Territory Regional Preserve, showing both the seasonal cycle and the typical day-to-night range. The comfort chart summarizes how often the combined weather pattern is favorable rather than judging temperature alone.
Precipitation shows the total recorded or modeled rainfall for each month at Morgan Territory Regional Preserve. Sunshine compares average bright-sky hours with the daylight available, while fog shows the average number of morning fog or low-cloud hours per day. Switch between the chart tabs to compare the same months across each measure.
Hourly Temperature, Fog, Wind, Cloud Cover, and Solar Radiation Patterns
Average local hour by month from 2014-09-30 to 2026-04-30
- Temperature: At Morgan Territory Regional Preserve, the warmest typical hour is 3 PM in July (80°F). The coldest is 7 AM in January (43°F).
- Fog: Fog or low cloud covers Morgan Territory Regional Preserve in 29% of 8 AM hours in December, the foggiest month. It thins slowly and often lasts into the early afternoon. October mornings are the least foggy (9%).
- Wind: From May through August, wind at Morgan Territory Regional Preserve typically builds after 4 PM. In May it peaks around 6 PM, averaging 15 mph with 50% of those hours windy, while mornings average 12 mph.
- Cloud Cover: July middays are the clearest at Morgan Territory Regional Preserve (2% average cloud cover), and January middays are the cloudiest (31%).
- Solar Radiation: The strongest typical sun at Morgan Territory Regional Preserve comes at 1 PM in June, averaging 1018 W/m².
How to read the hourly heatmaps for Morgan Territory Regional Preserve
This heatmap shows how average temperature at Morgan Territory Regional Preserve changes by hour and month. Read left to right for the seasons and top to bottom for the time of day. Warmer colors mark the usual afternoon peaks, and cooler colors show overnight and winter lows.
This heatmap shows when fog or low cloud is most likely at Morgan Territory Regional Preserve. Darker cells mark the months and hours when fog has been most common. They help separate overnight or morning fog from cloud that tends to linger into the afternoon.
This heatmap shows the typical hourly wind pattern at Morgan Territory Regional Preserve through the year. It makes recurring afternoon wind, calmer overnight periods, and seasonal changes easier to compare than a single daily wind value.
This heatmap shows average cloud cover at Morgan Territory Regional Preserve for every month and hour. Use it to see whether cloudiness is mainly an overnight and morning pattern or commonly persists during the part of the day you plan to visit.
This heatmap shows the average solar radiation reaching Morgan Territory Regional Preserve by month and hour. Brighter cells indicate the strongest typical sun, while muted cells can reflect nighttime, shorter winter days, cloud cover, smoke, or terrain shading.
Each cell combines one month with one local hour. Hover over or focus on a cell for its value and sample coverage. The red marker shows the current month and hour.
How recent months compared at Morgan Territory Regional Preserve
- October 2026 recap: October 2026 at Morgan Territory Regional Preserve averaged a high of 71°F, 6°F warmer than October 2025 (65°F).
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 20.8 in. of rain to Morgan Territory Regional Preserve, 100% of the 20.9 in. normal.
Location Details
Morgan Territory Regional Preserve weather questions
Everything you need to know about weather and visiting Morgan Territory Regional Preserve
What is the weather like at Morgan Territory Regional Preserve today?
It's 48°F at Morgan Territory Regional Preserve right now, with a comfort score of 61 (good). Today's forecast high at Morgan Territory Regional Preserve is 55°F, 6°F below the mid November normal of 61°F. The best window today is 8 AM to 11 AM, at about 49°F with a 13 mph wind (comfort 55).
What is the best month to visit Morgan Territory Regional Preserve?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Morgan Territory Regional Preserve are September, August, and June. The best hours are usually 11 AM to 2 PM in September, 9 AM to noon in August, and 11 AM to 2 PM in June. The warm season lasts about 3 months, from Jun 26 to Sep 25, when the average high is 80°F or warmer. Highs peak around Jul 8 at about 85°F.
What are the warmest and coldest months at Morgan Territory Regional Preserve?
July is the warmest month at Morgan Territory Regional Preserve, with an average high of 85°F. December is the coldest, with an average low of 41°F.
When does the fog burn off at Morgan Territory Regional Preserve?
Fog or low cloud covers Morgan Territory Regional Preserve in 29% of 8 AM hours in December, the foggiest month. It thins slowly and often lasts into the early afternoon. October mornings are the least foggy (9%).
When is it windiest at Morgan Territory Regional Preserve?
From May through August, wind at Morgan Territory Regional Preserve typically builds after 4 PM. In May it peaks around 6 PM, averaging 15 mph with 50% of those hours windy, while mornings average 12 mph.
How much rain does Morgan Territory Regional Preserve get?
January is the wettest month (4.1 in.), out of about 20.9 in. a year. The rainy season runs from Nov 13 to Apr 2, when a day has at least a 20% chance of measurable rain. That stretch brings 79% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 20.8 in. of rain to Morgan Territory Regional Preserve, 100% of the 20.9 in. normal.
What kind of place is Morgan Territory Regional Preserve?
High on the sandstone hills east of Mount Diablo, Morgan Territory Regional Preserve covers more than 5,300 acres of grassland and oak woodland. Only a narrow, winding road from Livermore or Clayton reaches it. The East Bay Regional Park District manages it as a land bridge between Mount Diablo State Park and Round Valley. The main staging area sits on a pass at about 2,000 feet. From the ridgetops the views run to Mount Diablo, Mount St. Helena, and the Sierra Nevada.
What is Morgan Territory Regional Preserve weather like in November?
November at Morgan Territory Regional Preserve averages a high of 61°F and a low of 46°F, with 2.2 in. of rain over about 6 rainy days. About 13% of morning hours are foggy. Afternoon wind averages 8 mph.
More about Morgan Territory Regional Preserve weather
Guides that explain the weather here and nearby
Data sources and methods
- Monthly temperatures and precipitation: NOAA 1991-2020 normals.
- Fog, cloud, wind, sun, and comfort by hour and month: NOAA's HRRR hourly analysis from September 2014 to April 2026.
- Daily records and recent months: NOAA URMA and HRRR analyses, plus NOAA Stage IV precipitation.
- Nearby comparisons and regional rankings use the same hourly HRRR summaries for every destination in the region.
- Alerts: National Weather Service. Tides and ocean temperature: NOAA CO-OPS, where shown.
- All statements on this page are computed from these datasets, apart from the “What shapes the weather” guide, which cites its sources inline.
- East Bay Regional Park District, Morgan Territory Regional Preserve (updated Oct. 26, 2026) (accessed 2026-10-27)
- East Bay Regional Park District, Morgan Territory map brochure (2025) (accessed 2026-10-27)
- Patrick L. Shabram, Mesoclimate Patterns of the Livermore Valley AVA (2017, prepared for the Livermore Valley Winegrowers Association) (accessed 2026-10-27)
- Contra Costa News, East Bay Regional Park closures extended through Friday (July 4, 2024) (accessed 2026-10-27)
Rendered 2026-11-15T12:04:24.480Z.