Olompali State Historic Park Weather
Park • San Francisco Bay Area
Olompali State Historic Park spreads up the east-facing slopes of Mount Burdell just north of Novato, looking out over Highway 101, the Petaluma River, and San Pablo Bay. The Coast Miwok lived here for thousands of years, and the park keeps a grinding boulder called kitchen rock and a reconstructed Coast Miwok village. It also holds the remains of the Burdell family's ranch and mansion. Unlike the county preserve on the summit above it, Olompali is a gated, fee-charging state park with set daily hours and a short loop through the lower hillside.
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10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
Olompali State Historic Park weather today and through the year
It's 53°F at Olompali State Historic Park right now (feels like 51°F), with 4 mph wind and a comfort score of 77. Monday's forecast high at Olompali State Historic Park is 58°F, 6°F below the mid November normal of 64°F. No fog in the forecast for today at Olompali State Historic Park. In November, 30% of morning hours here are foggy on average. The best window today is 9 AM to noon, at about 53°F with a 4 mph wind (comfort 59).
September is the warmest month at Olompali State Historic Park, with an average high of 78°F. January is the coldest, with an average low of 40°F. December is the wettest month (5.8 in.), out of about 28.3 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Olompali State Historic Park are September, August, and July. The best hours are usually 11 AM to 2 PM in September, 10 AM to 1 PM in August, and 10 AM to 1 PM in July.
Olompali faces east, toward the Petaluma River marshes and San Pablo Bay, with the bulk of Mount Burdell rising to the west. The hillside gets the morning sun first. It falls into the mountain's shadow earlier in the evening than the open, south-facing slopes of the county preserve next door. The ridges of West Marin block much of the coastal fog, so afternoons are usually sunny. Gray mornings are still common in midsummer and in midwinter.
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 Olompali State Historic Park in the next few days
No active National Weather Service alerts for this location.
Fog
No fog in the forecast for today at Olompali State Historic Park. In November, 30% of morning hours here are foggy on average.
Best time to go
The best window today is 9 AM to noon, at about 53°F with a 4 mph wind (comfort 59).
Hiking conditions
Best hiking day this week: Monday, with 9 daylight hours that are dry, 45 to 80°F, and under 18 mph wind. 4 of the next 7 days have at least 4 such hours.
Best day this week
Of the next 7 days, Friday looks best for Olompali State Historic Park, with a 60°F high and midday comfort near 74. Today looks weakest (50).
Rain
Next good chance of rain: today (81%, about 0.42 in.).
Live weather map
Weather around Olompali State Historic Park right now
Overcast and 53° at Olompali State Historic Park right now.
About the live weather map for Olompali State Historic Park
The map centers on Olompali State Historic 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.
Olompali State Historic Park vs nearby places
Typical summer conditions compared with Olompali State Historic 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 Olompali State Historic Park |
|---|---|---|---|---|---|
| Mount Burdell Open Space Preserve | 1.3 mi | same | 35% | 9 mph | same 3 km weather-model cell, so our hourly data cannot tell them apart |
| Novato | 3.1 mi | +3°F | 17% | 9 mph | less summer morning fog (17% vs 35% of morning hours) |
| Petaluma | 6.6 mi | +1°F | 33% | 10 mph | a very similar climate |
| Limantour Beach | 19 mi | -22°F | 44% | 10 mph | about 22°F cooler on summer afternoons and about 26% more rain a year |
| Rodeo Beach | 22.2 mi | -22°F | 48% | 13 mph | about 22°F cooler on summer afternoons and more summer morning fog (48% vs 35% of morning hours) |
| Dillon Beach | 22.5 mi | -24°F | 43% | 12 mph | about 24°F cooler on summer afternoons and about 36% more rain a year |
Places with a climate like Olompali State Historic Park's
- Occidental (27 mi away): nearly the same temperatures every month
- Portola Redwoods State Park (65 mi away): similar temperatures through the year
- Windy Hill Open Space (57 mi away): similar temperatures through the year
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Olompali State Historic Park climate comparisons mean
These cards compare recent conditions at Olompali State Historic 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 Olompali State Historic 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.
Olompali State Historic Park weather by month
September is the warmest month at Olompali State Historic Park, with an average high of 78°F. January is the coldest, with an average low of 40°F. December is the wettest month (5.8 in.), out of about 28.3 in. a year. Morning fog peaks in December, when fog or low cloud covers 43% of the hours from 6 to 10 AM. July has the clearest middays, with clouds covering about 11% of the sky from 11 AM to 3 PM.
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Olompali State Historic Park are September, August, and July. The best hours are usually 11 AM to 2 PM in September, 10 AM to 1 PM in August, and 10 AM to 1 PM in July.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 57°F | 40°F | 5.6 in | 10 | 40% | 37% | 7 mph | 9.8 h | 31 |
| Feb | 61°F | 42°F | 5.5 in | 10 | 22% | 27% | 9 mph | 10.7 h | 39 |
| Mar | 64°F | 43°F | 3.9 in | 8 | 23% | 31% | 10 mph | 11.9 h | 60 |
| Apr | 66°F | 45°F | 1.8 in | 5 | 20% | 26% | 10 mph | 13.2 h | 69 |
| May | 70°F | 48°F | 0.9 in | 4 | 25% | 22% | 11 mph | 14.3 h | 75 |
| Jun | 76°F | 51°F | 0.2 in | 2 | 24% | 11% | 11 mph | 14.8 h | 84 |
| Jul | 77°F | 52°F | 0.0 in | 0 | 42% | 11% | 9 mph | 14.5 h | 85 |
| Aug | 78°F | 52°F | 0.0 in | 1 | 38% | 12% | 9 mph | 13.6 h | 86 |
| Sep | 78°F | 51°F | 0.1 in | 1 | 30% | 14% | 9 mph | 12.3 h | 89 |
| Oct | 74°F | 48°F | 1.4 in | 5 | 24% | 18% | 8 mph | 11.1 h | 82 |
| Nov | 64°F | 44°F | 3.1 in | 7 | 30% | 23% | 7 mph | 10.0 h | 62 |
| Dec | 57°F | 40°F | 5.8 in | 10 | 43% | 41% | 7 mph | 9.5 h | 27 |
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 Olompali State Historic Park's weather different
When the fog burns off
47%of 8 AM hours foggy in December
Fog or low cloud covers Olompali State Historic Park in 47% of 8 AM hours in December, the foggiest month. It often lingers, and 19% of mid-afternoon hours are still foggy. April mornings are the least foggy (20%).
When the wind picks up
3 PMwhen afternoon wind builds, March–October
From March through October, wind at Olompali State Historic Park typically builds after 3 PM. In May it peaks around 5 PM, averaging 13 mph with 26% of those hours windy, while mornings average 7 mph.
Model resolution
2 placesshare one 3 km NOAA HRRR grid cell
Olompali State Historic Park shares one 3 km grid cell in NOAA's HRRR model with Mount Burdell Open Space Preserve. The places in that cell range from 78 to 1,532 ft. The hourly fog, wind, cloud, and temperature patterns on this site are the same for both. Real differences between them come from hills, elevation, and wind exposure that the model cannot resolve.
Daylight
9.5–14.8 hof daylight, Dec to Jun
Days at Olompali State Historic Park range from about 9.5 hours in December to 14.8 hours in June. In mid-June the sun sets around 8:34 PM, and in mid-December around 4:55 PM.
Seasons at Olompali State Historic Park
- Warm seasonJun 28 – Sep 30 · highs 76°F+
The warm season lasts about 3.1 months, from Jun 28 to Sep 30, when the average high is 76°F or warmer. Highs peak around Sep 8 at about 78°F.
- Cool seasonNov 28 – Feb 27 · highs 62°F or lower
The cool season runs from Nov 28 to Feb 27, when the average high is 62°F or lower. The coldest nights come around Jan 1, with an average low near 40°F.
- Rainy seasonNov 1 – Apr 9 · 86% of the year's rain
The rainy season runs from Nov 1 to Apr 9, when a day has at least a 20% chance of measurable rain. That stretch brings 86% 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 22 and half of its annual total by Jan 22.
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, Olompali State Historic Park averaged 20 days a year at 90°F or hotter and 1 night a year at or below freezing. It averaged 21 days a year with at least half an inch of rain and 4 afternoons with wind of 20 mph or more at 2 PM. About 142 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Sep 9, 2026 (100°F) and the coldest night was Feb 10, 2025 (32°F). The wettest day was Nov 21, 2024 (3.43 in.), and the strongest 2 PM gust was 46 mph on Mar 12, 2025.
- 20days at 90°F or hotter
- 1night at or below freezing
- 21days with ½ in. of rain or more
- 4afternoons with 20+ mph wind
- 142mornings with 3+ hours of fog or low cloud
- Hottest day100°FSep 9, 2026
- Coldest night32°FFeb 10, 2025
- Wettest day3.43 inNov 21, 2024
- Strongest 2 PM gust46 mphMar 12, 2025
What shapes Olompali State Historic Park's weather
The low, flat ground east of the park is where the bay's influence comes in. On summer afternoons a breeze drifts up from San Pablo Bay and along the Petaluma River, taking a little of the edge off the heat. Olompali itself is well inland of the cool coastal belt. State Parks describes summers here as hot and springs as warm.
Fall and winter are cooler. On clear winter mornings the lower meadows are the chilliest spots, because cold air drains off the mountain and settles near the highway. Winter rain greens the grassland, and by summer the hillside dries out. In fall, dry offshore winds blowing from inland toward the coast bring fire weather.
Tips for visiting Olompali State Historic Park
Arrive well before the 5 p.m. gate
The park is open daily from 9 a.m. to 5 p.m., and the gate closes promptly at 5 p.m. Long summit hikes need an early start.
Borrow a library parks pass
A California State Parks pass that you can borrow free from public libraries, including Novato's, covers the vehicle day-use fee.
Dress in layers
State Parks recommends layered clothing. Summers are hot, springs are warm, and fall and winter can be cool.
Keep dogs and bikes off the trails
Dogs are allowed only in developed areas, and both dogs and bikes are prohibited on park trails.
Choose the loop or the summit
The 2.5-mile Miwok Loop Trail covers the lower hillside, while the climb to the Mount Burdell summit is about 9 miles round trip.
Save the summit for a mild day
The climb up Mount Burdell is long and exposed. When the National Weather Service issues a heat advisory or a Red Flag Warning for fire weather, stick to the lower loop early in the day.
Olompali State Historic Park through the seasons
- Spring (March–May)
- Spring is warm and green, and it is the best time for the Miwok Loop, with grassland in bloom and creeks still running.
- Summer (June–August)
- Summer is hot. Walk the loop in the morning, when the east-facing hillside is still cool, because the mountain's shade arrives only after the 5 p.m. closing.
- Fall (September–November)
- September stays warm, and days cool through October and November. Dry grass and occasional offshore winds raise fire danger. Bring layers for cool mornings.
- Winter (December–February)
- Winter mornings are cool and often gray, and rain greens the hills. Upper trails can be muddy after storms.
Activities and the weather that matters
- Walking the Miwok Loop: The 2.5-mile loop climbs the lower slope. It is best on mild mornings in spring and fall.
- Hiking to Mount Burdell's summit: The hike is about 9 miles round trip with a long climb. Pick a cool, clear day and leave time to be back before the 5 p.m. gate.
- Exploring the ranch and Miwok sites: The mansion ruins, gardens, and village site are fine in most weather. Summer afternoons are the least comfortable time.
Official sources and current conditions
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 | 77 | 63° / 44.9° | 6.2h | 8d | 9.95" | 17 |
| December 2024 | 67 | 58.2° / 44.9° | 4.8h | 15d | 8.27" | 12 |
| January 2025 | 82 | 60.6° / 40.8° | 6.9h | 7d | 0.38" | 20 |
| February 2025 | 74 | 60.9° / 42.8° | 6.3h | 9d | 10.88" | 14 |
| March 2025 | 79 | 61.5° / 44.6° | 7.9h | 9d | 3.34" | 16 |
| April 2025 | 90 | 66.9° / 46.2° | 10h | 7d | 0.43" | 27 |
| May 2025 | 94 | 73.6° / 49.9° | 12.3h | 3d | 0.13" | 31 |
| June 2025 | 94 | 75.9° / 51° | 12.5h | 9d | 0" | 30 |
| July 2025 | 90 | 77.5° / 53.9° | 12.1h | 14d | 0" | 30 |
| August 2025 | 90 | 84.1° / 55.2° | 11.5h | 7d | 0" | 30 |
| September 2025 | 89 | 81° / 57.6° | 9.6h | 9d | 0.06" | 27 |
| October 2025 | 86 | 73.2° / 52° | 7.9h | 10d | 1.21" | 27 |
| November 2025 | 75 | 64° / 49.5° | 6.2h | 17d | 5.02" | 13 |
| December 2025 | 60 | 54° / 44.1° | 4.8h | 21d | 6.44" | 3 |
| January 2026 | 75 | 59.4° / 43.8° | 6.5h | 12d | 6.32" | 19 |
| February 2026 | 75 | 63° / 46.3° | 6.1h | 8d | 5.87" | 16 |
| March 2026 | 95 | 76.2° / 50.2° | 9.6h | 1d | 0.05" | 30 |
| April 2026 | 86 | 67.3° / 48° | 9.3h | 5d | 4.51" | 24 |
| May 2026 | 90 | 72.1° / 51.3° | 11.7h | 9d | 1.07" | 29 |
| June 2026 | 92 | 78.4° / 54° | 12.3h | 11d | 0.01" | 29 |
| July 2026 | 92 | 81° / 54.9° | 11.8h | 10d | 0" | 31 |
| August 2026 | 91 | 82.2° / 55.1° | 11.1h | 10d | 0.02" | 31 |
| September 2026 | 90 | 80.2° / 54.5° | 9.8h | 6d | 0.28" | 27 |
| October 2026 | 90 | 78.9° / 49.9° | 8.5h | 2d | 0.15" | 28 |
Climate Trends
Average Temperature by Month
About the Olompali State Historic Park climate charts
The temperature chart compares average monthly highs and lows at Olompali State Historic 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 Olompali State Historic 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 Olompali State Historic Park, the warmest typical hour is 3 PM in August (81°F). The coldest is 7 AM in December (44°F).
- Fog: Fog or low cloud covers Olompali State Historic Park in 47% of 8 AM hours in December, the foggiest month. It often lingers, and 19% of mid-afternoon hours are still foggy. April mornings are the least foggy (20%).
- Wind: From March through October, wind at Olompali State Historic Park typically builds after 3 PM. In May it peaks around 5 PM, averaging 13 mph with 26% of those hours windy, while mornings average 7 mph.
- Cloud Cover: July middays are the clearest at Olompali State Historic Park (11% average cloud cover), and December middays are the cloudiest (41%).
- Solar Radiation: The strongest typical sun at Olompali State Historic Park comes at 1 PM in June, averaging 976 W/m².
How to read the hourly heatmaps for Olompali State Historic Park
This heatmap shows how average temperature at Olompali State Historic 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 Olompali State Historic 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 Olompali State Historic 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 Olompali State Historic 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 Olompali State Historic 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 Olompali State Historic Park
- October 2026 recap: October 2026 at Olompali State Historic Park averaged a high of 79°F, 5°F warmer than the 1991-2020 normal of 74°F. It brought 0.15 in. of rain, compared with a normal of 1.42 in.
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 30.8 in. of rain to Olompali State Historic Park, 109% of the 28.3 in. normal.
Location Details
Olompali State Historic Park weather questions
Everything you need to know about weather and visiting Olompali State Historic Park
What is the weather like at Olompali State Historic Park today?
It's 53°F at Olompali State Historic Park right now, with a comfort score of 77 (great). Monday's forecast high at Olompali State Historic Park is 58°F, 6°F below the mid November normal of 64°F. The best window today is 9 AM to noon, at about 53°F with a 4 mph wind (comfort 59).
What is the best month to visit Olompali State Historic Park?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Olompali State Historic Park are September, August, and July. The best hours are usually 11 AM to 2 PM in September, 10 AM to 1 PM in August, and 10 AM to 1 PM in July. The warm season lasts about 3.1 months, from Jun 28 to Sep 30, when the average high is 76°F or warmer. Highs peak around Sep 8 at about 78°F.
What are the warmest and coldest months at Olompali State Historic Park?
September is the warmest month at Olompali State Historic Park, with an average high of 78°F. January is the coldest, with an average low of 40°F.
When does the fog burn off at Olompali State Historic Park?
Fog or low cloud covers Olompali State Historic Park in 47% of 8 AM hours in December, the foggiest month. It often lingers, and 19% of mid-afternoon hours are still foggy. April mornings are the least foggy (20%).
When is it windiest at Olompali State Historic Park?
From March through October, wind at Olompali State Historic Park typically builds after 3 PM. In May it peaks around 5 PM, averaging 13 mph with 26% of those hours windy, while mornings average 7 mph.
How much rain does Olompali State Historic Park get?
December is the wettest month (5.8 in.), out of about 28.3 in. a year. The rainy season runs from Nov 1 to Apr 9, when a day has at least a 20% chance of measurable rain. That stretch brings 86% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 30.8 in. of rain to Olompali State Historic Park, 109% of the 28.3 in. normal.
Can I bring my dog to Olompali?
Yes, but only in developed areas. State Parks says dogs are not allowed on trails, dirt roads, backcountry areas, historic buildings, or historic gardens.
What kind of place is Olompali State Historic Park?
Olompali State Historic Park spreads up the east-facing slopes of Mount Burdell just north of Novato, looking out over Highway 101, the Petaluma River, and San Pablo Bay. The Coast Miwok lived here for thousands of years, and the park keeps a grinding boulder called kitchen rock and a reconstructed Coast Miwok village. It also holds the remains of the Burdell family's ranch and mansion. Unlike the county preserve on the summit above it, Olompali is a gated, fee-charging state park with set daily hours and a short loop through the lower hillside.
What is Olompali State Historic Park weather like in November?
November at Olompali State Historic Park averages a high of 64°F and a low of 44°F, with 3.1 in. of rain over about 7 rainy days. About 30% of morning hours are foggy. Afternoon wind averages 7 mph.
More about Olompali State Historic Park 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.
- California State Parks, Olompali State Historic Park (accessed 2026-10-27)
- National Weather Service, San Francisco Bay Area forecast office (accessed 2026-10-27)
Rendered 2026-11-15T12:16:25.149Z.