Henry W. Coe State Park Weather
Park • San Francisco Bay Area
More than 87,000 acres of the Diablo Range east of Morgan Hill make up Henry W. Coe State Park, the largest state park in Northern California. The main entrance and campground sit on top of Pine Ridge at 2,600 feet, at the end of East Dunne Avenue. From there, steep dirt roads drop into the forks of Coyote Creek and climb toward the Orestimba Wilderness. California State Parks keeps it largely undeveloped, so this is backcountry with few facilities, unlike the valley parks below.
Plan your week
10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
Henry W. Coe State Park weather today and through the year
It's 48°F at Henry W. Coe State Park right now (feels like 45°F), with 3 mph wind and a comfort score of 69. Monday's forecast high at Henry W. Coe State Park is 50°F, 11°F below the mid November normal of 61°F. The best window today is 8 AM to 11 AM, at about 53°F with a 10 mph wind (comfort 74).
August is the warmest month at Henry W. Coe State Park, with an average high of 85°F. December is the coldest, with an average low of 38°F. January is the wettest month (6.3 in.), out of about 30.8 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Henry W. Coe State Park are September, October, and June. The best hours are usually 9 AM to noon in September, 11 AM to 2 PM in October, and 8 AM to 11 AM in June.
Coe lies on the inland side of the Santa Clara Valley, behind the Santa Cruz Mountains and well away from both San Francisco Bay and Monterey Bay. By the time summer sea breezes cross the valley they have warmed up, and they rarely reach the canyons east of Pine Ridge at all. That leaves Coe hot and dry in summer, and its backcountry canyons run hotter than Morgan Hill.
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 Henry W. Coe State Park in the next few days
No active National Weather Service alerts for this location.
Best time to go
The best window today is 8 AM to 11 AM, at about 53°F with a 10 mph wind (comfort 74).
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 Henry W. Coe State Park, with a 53°F high and midday comfort near 66. Wednesday looks weakest (36).
Rain
Next good chance of rain: today (51%).
Live weather map
Weather around Henry W. Coe State Park right now
Overcast and 48° at Henry W. Coe State Park right now.
About the live weather map for Henry W. Coe State Park
The map centers on Henry W. Coe State Park 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.
Henry W. Coe State Park vs nearby places
Typical summer conditions compared with Henry W. Coe State Park, 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 Henry W. Coe State Park |
|---|---|---|---|---|---|
| Morgan Hill | 8.2 mi | +1°F | 25% | 8 mph | more summer morning fog (25% vs 12% of morning hours) and about 29% less rain a year |
| Gilroy | 12.6 mi | same | 15% | 6 mph | calmer summer afternoons (6 vs 11 mph) and about 36% less rain a year |
| Lick Observatory (Mt. Hamilton) | 12.7 mi | -8°F | 2% | 10 mph | 2,477 ft higher and about 8°F cooler on summer afternoons |
| Uvas Canyon County Park | 16.6 mi | -2°F | 26% | 7 mph | more summer morning fog (26% vs 12% of morning hours) and calmer summer afternoons (7 vs 11 mph) |
| Watsonville | 22.9 mi | -16°F | 34% | 9 mph | about 16°F cooler on summer afternoons and more summer morning fog (34% vs 12% of morning hours) |
Places with a climate like Henry W. Coe State Park's
- Robert Louis Stevenson State Park (117 mi away): similar temperatures through the year
- Boggs Mountain Demonstration State Forest (131 mi away): similar temperatures through the year
- Angwin (108 mi away): similar temperatures through the year
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Henry W. Coe State Park climate comparisons mean
These cards compare recent conditions at Henry W. Coe State Park 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 Henry W. Coe State Park 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.
Henry W. Coe State Park weather by month
August is the warmest month at Henry W. Coe State Park, with an average high of 85°F. December is the coldest, with an average low of 38°F. January is the wettest month (6.3 in.), out of about 30.8 in. a year. Morning fog peaks in December, when fog or low cloud covers 21% 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 Henry W. Coe State Park are September, October, and June. The best hours are usually 9 AM to noon in September, 11 AM to 2 PM in October, and 8 AM to 11 AM in June.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 54°F | 39°F | 6.3 in | 11 | 15% | 27% | 6 mph | 9.9 h | 41 |
| Feb | 55°F | 39°F | 5.9 in | 10 | 12% | 23% | 7 mph | 10.8 h | 41 |
| Mar | 58°F | 40°F | 4.9 in | 9 | 15% | 27% | 8 mph | 11.9 h | 49 |
| Apr | 62°F | 42°F | 2.1 in | 6 | 15% | 20% | 9 mph | 13.1 h | 75 |
| May | 70°F | 47°F | 1.0 in | 4 | 15% | 13% | 11 mph | 14.2 h | 80 |
| Jun | 78°F | 53°F | 0.2 in | 2 | 11% | 5% | 11 mph | 14.7 h | 84 |
| Jul | 85°F | 60°F | 0.0 in | 0 | 11% | 2% | 11 mph | 14.5 h | 82 |
| Aug | 85°F | 59°F | 0.1 in | 1 | 15% | 3% | 10 mph | 13.5 h | 82 |
| Sep | 81°F | 56°F | 0.1 in | 1 | 13% | 6% | 9 mph | 12.3 h | 88 |
| Oct | 73°F | 50°F | 1.3 in | 5 | 12% | 9% | 7 mph | 11.1 h | 85 |
| Nov | 61°F | 43°F | 2.7 in | 7 | 11% | 16% | 6 mph | 10.1 h | 69 |
| Dec | 54°F | 38°F | 6.1 in | 10 | 21% | 27% | 6 mph | 9.6 h | 40 |
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 Henry W. Coe State Park's weather different
Among the 58 San Francisco Bay Area parks we track, Henry W. Coe State Park has the 2nd-sunniest summer middays and the coldest winter nights.
- #2of 58
sunniest summer middaysamong San Francisco Bay Area parks
- #1of 58
coldest winter nightsamong San Francisco Bay Area parks
When the fog burns off
1 PMwhen December fog usually thins (24% foggy at 7 AM)
Fog or low cloud covers Henry W. Coe State Park in 24% of 7 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. June mornings are the least foggy (11%).
When the wind picks up
2 PMwhen afternoon wind builds, April–September
From April through September, wind at Henry W. Coe State Park typically builds after 2 PM. In July it peaks around 7 PM, averaging 12 mph with 14% of those hours windy, while mornings average 7 mph.
Hot hours
4 habove 85°F on a typical July afternoon
In July, the average temperature stays at or above 85°F for 4 hours a day.
Daylight
9.6–14.7 hof daylight, Dec to Jun
Days at Henry W. Coe State Park range from about 9.6 hours in December to 14.7 hours in June. In mid-June the sun sets around 8:27 PM, and in mid-December around 4:54 PM.
Seasons at Henry W. Coe State Park
- Warm seasonJun 26 – Sep 26 · highs 79°F+
The warm season lasts about 3.1 months, from Jun 26 to Sep 26, when the average high is 79°F or warmer. Highs peak around Aug 8 at about 85°F.
- Cool seasonDec 1 – Mar 2 · highs 57°F or lower
The cool season runs from Dec 1 to Mar 2, when the average high is 57°F or lower. The coldest nights come around Dec 8, with an average low near 38°F.
- Rainy seasonNov 5 – Apr 15 · 87% of the year's rain
The rainy season runs from Nov 5 to Apr 15, when a day has at least a 20% chance of measurable rain. That stretch brings 87% 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 Oct 24 and half of its annual total by Jan 26.
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, Henry W. Coe State Park averaged 38 days a year at 90°F or hotter and 12 nights a year at or below freezing. It averaged 16 days a year with at least half an inch of rain and 2 afternoons with wind of 20 mph or more at 2 PM. About 51 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Sep 9, 2026 (99°F) and the coldest night was Feb 10, 2025 (27°F). The wettest day was Feb 14, 2025 (3.85 in.), and the strongest 2 PM gust was 43 mph on Feb 13, 2025.
- 38days at 90°F or hotter
- 12nights at or below freezing
- 16days with ½ in. of rain or more
- 2afternoons with 20+ mph wind
- 51mornings with 3+ hours of fog or low cloud
- Hottest day99°FSep 9, 2026
- Coldest night27°FFeb 10, 2025
- Wettest day3.85 inFeb 14, 2025
- Strongest 2 PM gust43 mphFeb 13, 2025
What shapes Henry W. Coe State Park's weather
Elevation shapes the day at Henry Coe. Pine Ridge sits more than 2,000 feet above the valley floor, often above the shallow layer of cool air that collects in the Santa Clara Valley overnight. That lets park headquarters stay warmer than Morgan Hill on summer nights. The deep canyons of Coyote Creek and Orestimba Creek work in reverse, trapping afternoon heat and collecting cold air before dawn.
Winter storms that cross the Santa Cruz Mountains still have enough moisture to soak Coe's ridges. Seasonal creeks rise fast and can become impassable. Chilly days and cold nights make winter feel very different from the summer park.
In fall, offshore winds blow west across the Diablo Range from the dry interior toward the coast. The park's dry grass and chaparral make fire a real concern. Park staff can ban wood and charcoal fires during fire season, and backcountry fires are never allowed.
Tips for visiting Henry W. Coe State Park
Start early and finish late in summer
Readings above 90°F from late morning into the evening are not unusual. The park's own trip guides advise hiking early and late and planning shorter trips.
Carry all the water you need
Most creeks dry up by summer. Bring plenty of water, and a filter or purifier for routes longer than about 5 miles.
Check creek crossings after storms
Winter storms can swell creeks enough to leave hikers stuck on the wrong side. Plan routes with that in mind.
Arrive early on spring weekends
Parking is limited during spring and holiday weekends, so carpool or get there early.
Dogs stay near headquarters
Dogs are allowed only at the Coe Ranch entrance, the campground, paved areas, and the short Live Oak Trail.
Henry W. Coe State Park through the seasons
- Spring (March–May)
- Spring is the best time to visit. Wildflowers bloom in profusion from February through March, peak in April, and continue with mariposa lilies in late April and May.
- Summer (June–August)
- Summer is hot and dry, with many afternoons above 90°F and cooler nights. Most creeks dry up, leaving only a few year-round water holes.
- Fall (September–November)
- Heat eases through the fall and hiking becomes comfortable again, but the creeks stay dry and fire danger stays high until the first real rain. Wood and charcoal campfires may be banned during fire season, so check with staff.
- Winter (December–February)
- Winter is the wet season, and cold nights on Pine Ridge drop into the mid-30s or below. From Hobbs Road near 3,000 feet, clear winter days can show the snow-capped Sierra Nevada.
Activities and the weather that matters
- Backpacking: Spring and fall are ideal. Summer heat makes long routes dangerous, and winter storms can block creek crossings.
- Mountain biking: Riding here needs dry ground and moderate temperatures. The steep dirt roads are punishing on hot afternoons and slick after rain.
- Swimming holes: Best in spring while creeks are still running. By summer most creeks are dry except for a few year-round pools.
- Wildflower walks: Peak bloom comes in April after a wet winter, on mild days before the grass turns gold.
Official sources and current conditions
- California State Parks: Henry W. Coe State Park
- Coe Ranch Campground guide (PDF)
- ReserveCalifornia: campsite reservations
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 | 83 | 61.6° / 39.7° | 7.1h | 2d | 2.49" | 23 |
| December 2024 | 75 | 62.3° / 40.1° | 5.3h | 9d | 4.3" | 16 |
| January 2025 | 85 | 61.1° / 35.7° | 7.3h | 4d | 0.28" | 25 |
| February 2025 | 78 | 59.7° / 37.6° | 6.6h | 4d | 8.84" | 16 |
| March 2025 | 79 | 60.1° / 38° | 8.5h | 5d | 4.61" | 17 |
| April 2025 | 91 | 67.3° / 40.8° | 10.2h | 6d | 1.16" | 25 |
| May 2025 | 93 | 76.5° / 47° | 12.1h | 1d | 0.1" | 30 |
| June 2025 | 91 | 84° / 50.9° | 13h | 0d | 0" | 30 |
| July 2025 | 93 | 83.4° / 54° | 12.7h | 1d | 0" | 31 |
| August 2025 | 90 | 88.2° / 59.5° | 11.5h | 0d | 0" | 31 |
| September 2025 | 92 | 80.8° / 56.7° | 10.1h | 2d | 0.08" | 29 |
| October 2025 | 89 | 70.6° / 48.6° | 8.2h | 4d | 2.08" | 28 |
| November 2025 | 80 | 64.5° / 45.1° | 6.8h | 6d | 4.9" | 18 |
| December 2025 | 78 | 61.6° / 42.3° | 5.8h | 9d | 2.42" | 18 |
| January 2026 | 84 | 62.5° / 40° | 7.1h | 3d | 3.13" | 23 |
| February 2026 | 78 | 61.9° / 41.2° | 7.3h | 5d | 5.97" | 18 |
| March 2026 | 94 | 74° / 48.5° | 9.9h | 1d | 0" | 30 |
| April 2026 | 88 | 64.1° / 43.5° | 10h | 2d | 3.23" | 22 |
| May 2026 | 93 | 72.5° / 47.4° | 12h | 2d | 0.35" | 29 |
| June 2026 | 94 | 80.4° / 53.1° | 12.8h | 1d | 0" | 30 |
| July 2026 | 91 | 86.3° / 57.4° | 12.5h | 1d | 0" | 31 |
| August 2026 | 89 | 88.4° / 59.2° | 11.2h | 2d | 0.09" | 30 |
| September 2026 | 93 | 80.2° / 52.3° | 10.5h | 3d | 0.05" | 29 |
| October 2026 | 88 | 77° / 49.7° | 8.5h | 0d | 0.3" | 28 |
Climate Trends
Average Temperature by Month
About the Henry W. Coe State Park climate charts
The temperature chart compares average monthly highs and lows at Henry W. Coe State Park, 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 Henry W. Coe State Park. 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 Henry W. Coe State Park, the warmest typical hour is 3 PM in August (86°F). The coldest is 6 AM in January (43°F).
- Fog: Fog or low cloud covers Henry W. Coe State Park in 24% of 7 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. June mornings are the least foggy (11%).
- Wind: From April through September, wind at Henry W. Coe State Park typically builds after 2 PM. In July it peaks around 7 PM, averaging 12 mph with 14% of those hours windy, while mornings average 7 mph.
- Cloud Cover: July middays are the clearest at Henry W. Coe State Park (2% average cloud cover), and March middays are the cloudiest (27%).
- Solar Radiation: The strongest typical sun at Henry W. Coe State Park comes at 1 PM in July, averaging 1019 W/m².
How to read the hourly heatmaps for Henry W. Coe State Park
This heatmap shows how average temperature at Henry W. Coe State Park 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 Henry W. Coe State Park. 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 Henry W. Coe State Park 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 Henry W. Coe State Park 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 Henry W. Coe State Park 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 Henry W. Coe State Park
- October 2026 recap: October 2026 at Henry W. Coe State Park averaged a high of 77°F, 4°F warmer than the 1991-2020 normal of 73°F. It brought 0.30 in. of rain, compared with a normal of 1.33 in.
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 22.2 in. of rain to Henry W. Coe State Park, 72% of the 30.8 in. normal.
Location Details
Henry W. Coe State Park weather questions
Everything you need to know about weather and visiting Henry W. Coe State Park
What is the weather like at Henry W. Coe State Park today?
It's 48°F at Henry W. Coe State Park right now, with a comfort score of 69 (good). Monday's forecast high at Henry W. Coe State Park is 50°F, 11°F below the mid November normal of 61°F. The best window today is 8 AM to 11 AM, at about 53°F with a 10 mph wind (comfort 74).
What is the best month to visit Henry W. Coe State Park?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Henry W. Coe State Park are September, October, and June. The best hours are usually 9 AM to noon in September, 11 AM to 2 PM in October, and 8 AM to 11 AM in June. The warm season lasts about 3.1 months, from Jun 26 to Sep 26, when the average high is 79°F or warmer. Highs peak around Aug 8 at about 85°F.
What are the warmest and coldest months at Henry W. Coe State Park?
August is the warmest month at Henry W. Coe State Park, with an average high of 85°F. December is the coldest, with an average low of 38°F.
When does the fog burn off at Henry W. Coe State Park?
Fog or low cloud covers Henry W. Coe State Park in 24% of 7 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. June mornings are the least foggy (11%).
When is it windiest at Henry W. Coe State Park?
From April through September, wind at Henry W. Coe State Park typically builds after 2 PM. In July it peaks around 7 PM, averaging 12 mph with 14% of those hours windy, while mornings average 7 mph.
How much rain does Henry W. Coe State Park get?
January is the wettest month (6.3 in.), out of about 30.8 in. a year. The rainy season runs from Nov 5 to Apr 15, when a day has at least a 20% chance of measurable rain. That stretch brings 87% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 22.2 in. of rain to Henry W. Coe State Park, 72% of the 30.8 in. normal.
Can you swim at Henry Coe State Park?
Only after a long hike. You have to go at least five miles to reach creeks suitable for swimming. The most popular spot, China Hole, is a strenuous 10-mile round trip with 1,500 feet of elevation gain. The pools are best in spring, since most creeks are dry by summer. Diving is prohibited.
What kind of place is Henry W. Coe State Park?
More than 87,000 acres of the Diablo Range east of Morgan Hill make up Henry W. Coe State Park, the largest state park in Northern California. The main entrance and campground sit on top of Pine Ridge at 2,600 feet, at the end of East Dunne Avenue. From there, steep dirt roads drop into the forks of Coyote Creek and climb toward the Orestimba Wilderness. California State Parks keeps it largely undeveloped, so this is backcountry with few facilities, unlike the valley parks below.
What is Henry W. Coe State Park weather like in November?
November at Henry W. Coe State Park averages a high of 61°F and a low of 43°F, with 2.7 in. of rain over about 7 rainy days. About 11% of morning hours are foggy. Afternoon wind averages 6 mph.
More about Henry W. Coe State Park weather
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.
- California State Parks, Henry W. Coe State Park (accessed 2026-10-27)
- California State Parks, Coe Ranch Campground at Henry W. Coe State Park (handout) (accessed 2026-10-27)
- Pine Ridge Association and California State Parks, Frog Lake backpacking trip guide (rev. 2019) (accessed 2026-10-27)
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