Geyserville Weather
Town • San Francisco Bay Area
Geyserville is a small unincorporated town on the floor of the Alexander Valley, about ten minutes north of Healdsburg. The Russian River runs past it on its way south from Mendocino County. Its main street is a short block of 19th-century false-front buildings and wooden boardwalks surrounded by vineyards. The town owes its name to the geothermal springs at The Geysers, high in the Mayacamas Mountains to the east. Those springs drew the tourists who first kept its businesses going.
Plan your week
10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
Geyserville weather today and through the year
It's 55°F at Geyserville right now (feels like 52°F), with 6 mph wind and a comfort score of 63. Today's forecast high at Geyserville is 56°F, 9°F below the mid November normal of 65°F. No fog in the forecast for today at Geyserville. In November, 26% of morning hours here are foggy on average. The best window today is 1 PM to 4 PM, at about 50°F with a 3 mph wind (comfort 63).
July is the warmest month at Geyserville, with an average high of 87°F. December is the coldest, with an average low of 37°F. December is the wettest month (8.1 in.), out of about 38.8 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Geyserville are September, May, and October. The best hours are usually 9 AM to noon in September, 11 AM to 2 PM in May, and 11 AM to 2 PM in October.
Geyserville sits near the upper limit of the summer fog's reach in Sonoma County. Marine air pushes inland through the Russian River canyon from Jenner and across the Santa Rosa Plain. It is usually spent by the time it gets past Healdsburg. Mornings here are more often clear, the heat builds earlier in the day, and afternoons run hotter than in the towns to the south.
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 Geyserville in the next few days
No active National Weather Service alerts for this location.
Fog
No fog in the forecast for today at Geyserville. In November, 26% of morning hours here are foggy on average.
Best time to go
The best window today is 1 PM to 4 PM, at about 50°F with a 3 mph wind (comfort 63).
Best day this week
Of the next 7 days, Friday looks best for Geyserville, with a 58°F high and midday comfort near 71. Tuesday looks weakest (50).
Rain
Next good chance of rain: today (94%, about 0.69 in.).
Live weather map
Weather around Geyserville right now
Light rain and 55° at Geyserville right now.
About the live weather map for Geyserville
The map centers on Geyserville 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.
Geyserville vs nearby places
Typical summer conditions compared with Geyserville, 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 Geyserville |
|---|---|---|---|---|---|
| Healdsburg | 6.6 mi | -2°F | 25% | 9 mph | a very similar climate |
| Cloverdale | 9.4 mi | +2°F | 18% | 9 mph | a very similar climate |
| Windsor | 11.7 mi | -4°F | 30% | 9 mph | about 4°F cooler on summer afternoons |
| Wright's Beach | 23.2 mi | -34°F | 47% | 9 mph | about 34°F cooler on summer afternoons and more summer morning fog (47% vs 22% of morning hours) |
| Schoolhouse Beach | 24.5 mi | -34°F | 51% | 9 mph | about 34°F cooler on summer afternoons and more summer morning fog (51% vs 22% of morning hours) |
| Salt Point State Park | 24.9 mi | -33°F | 41% | 10 mph | about 33°F cooler on summer afternoons and more summer morning fog (41% vs 22% of morning hours) |
Places with a climate like Geyserville's
- Rutherford (31 mi away): nearly the same temperatures every month
- Oakville (33 mi away): nearly the same temperatures every month
- Glen Ellen (31 mi away): nearly the same temperatures every month
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Geyserville climate comparisons mean
These cards compare recent conditions at Geyserville 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 Geyserville 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.
Geyserville weather by month
July is the warmest month at Geyserville, with an average high of 87°F. December is the coldest, with an average low of 37°F. December is the wettest month (8.1 in.), out of about 38.8 in. a year. Morning fog peaks in December, when fog or low cloud covers 38% of the hours from 6 to 10 AM. July has the clearest middays, with clouds covering about 5% of the sky from 11 AM to 3 PM.
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Geyserville are September, May, and October. The best hours are usually 9 AM to noon in September, 11 AM to 2 PM in May, and 11 AM to 2 PM in October.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 58°F | 38°F | 7.6 in | 12 | 36% | 36% | 6 mph | 9.8 h | 41 |
| Feb | 61°F | 40°F | 7.5 in | 12 | 21% | 29% | 7 mph | 10.7 h | 47 |
| Mar | 65°F | 41°F | 5.5 in | 10 | 22% | 32% | 7 mph | 11.9 h | 55 |
| Apr | 70°F | 43°F | 2.5 in | 7 | 18% | 24% | 8 mph | 13.2 h | 71 |
| May | 76°F | 47°F | 1.4 in | 5 | 16% | 18% | 9 mph | 14.3 h | 81 |
| Jun | 83°F | 51°F | 0.3 in | 2 | 13% | 7% | 9 mph | 14.9 h | 78 |
| Jul | 87°F | 53°F | 0.0 in | 0 | 26% | 5% | 9 mph | 14.6 h | 78 |
| Aug | 87°F | 53°F | 0.0 in | 1 | 28% | 7% | 8 mph | 13.6 h | 78 |
| Sep | 84°F | 50°F | 0.1 in | 2 | 27% | 10% | 7 mph | 12.3 h | 83 |
| Oct | 77°F | 46°F | 1.7 in | 6 | 24% | 17% | 6 mph | 11.1 h | 81 |
| Nov | 65°F | 41°F | 3.9 in | 8 | 26% | 23% | 6 mph | 10.0 h | 69 |
| Dec | 57°F | 37°F | 8.1 in | 12 | 38% | 38% | 5 mph | 9.5 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 Geyserville's weather different
When the fog burns off
1 PMwhen December fog usually thins (42% foggy at 5 AM)
Fog or low cloud covers Geyserville in 42% of 5 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. June mornings are the least foggy (13%).
When the wind picks up
2 PMwhen afternoon wind builds, April–September
From April through September, wind at Geyserville typically builds after 2 PM. In June it peaks around 5 PM, averaging 11 mph with 13% of those hours windy, while mornings average 5 mph.
Hot hours
6 habove 85°F on a typical July afternoon
In July, the average temperature stays at or above 85°F for 6 hours a day.
Daylight
9.5–14.9 hof daylight, Dec to Jun
Days at Geyserville range from about 9.5 hours in December to 14.9 hours in June. In mid-June the sun sets around 8:39 PM, and in mid-December around 4:57 PM.
Seasons at Geyserville
- Warm seasonJun 27 – Sep 23 · highs 84°F+
The warm season lasts about 2.9 months, from Jun 27 to Sep 23, when the average high is 84°F or warmer. Highs peak around Jul 8 at about 87°F.
- Hot afternoonsJul 1 – Sep 3 · highs 85°F+
Average highs reach 85°F or more from Jul 1 to Sep 3.
- Cool seasonNov 27 – Feb 28 · highs 63°F or lower
The cool season runs from Nov 27 to Feb 28, when the average high is 63°F or lower. The coldest nights come around Dec 8, with an average low near 37°F.
- Rainy seasonOct 23 – Apr 25 · 91% of the year's rain
The rainy season runs from Oct 23 to Apr 25, when a day has at least a 20% chance of measurable rain. That stretch brings 91% 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 18 and half of its annual total by Jan 23.
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, Geyserville averaged 45 days a year at 90°F or hotter and 6 nights a year at or below freezing. It averaged 25 days a year with at least half an inch of rain and 0 afternoons with wind of 20 mph or more at 2 PM. About 129 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Jun 11, 2026 (105°F) and the coldest night was Dec 10, 2024 (30°F). The wettest day was Nov 21, 2024 (6.87 in.), and the strongest 2 PM gust was 43 mph on Mar 12, 2025.
- 45days at 90°F or hotter
- 6nights at or below freezing
- 25days with ½ in. of rain or more
- 0afternoons with 20+ mph wind
- 129mornings with 3+ hours of fog or low cloud
- Hottest day105°FJun 11, 2026
- Coldest night30°FDec 10, 2024
- Wettest day6.87 inNov 21, 2024
- Strongest 2 PM gust43 mphMar 12, 2025
What shapes Geyserville's weather
The Alexander Valley is a long trough between the Mayacamas Mountains on the east and the lower hills toward Dry Creek Valley on the west. On clear nights, cold air slides off both slopes and collects on the valley floor along the river. That is why Geyserville mornings can be chilly even after a very hot day, and why spring frost is a worry for the vineyards around town.
The Mayacamas ridge to the east is also where the area's fall fire danger comes from. When dry northeast winds blow down from The Geysers, they push toward the Highway 101 corridor. In October 2019 the Kincade Fire started in The Geysers. The area east of Highway 128 from Geysers Road north to Geyserville was evacuated before orders spread south down the 101 corridor.
Tips for visiting Geyserville
Walk downtown in the cool hours
The old main street of false-front shops and boardwalks is short, so a morning or early evening stroll avoids the valley's afternoon heat.
Book summer tastings early or late
The Alexander Valley follows the Russian River, with mountain vineyards on the hills above it. Book outdoor tastings for morning or late afternoon in summer.
Treat high-90s heat as serious
Sonoma County warns that fans won't prevent heat illness once temperatures reach the high 90s. Plan an air-conditioned stop on the hottest afternoons.
Sign up for SoCoAlert in fire season
Sign up for SoCoAlert and Nixle, the county's channels for evacuation orders. Look up your evacuation zone on the county's Know Your Zone map before you go.
Expect power shutoffs on windy fall days
PG&E may cut power anywhere in Sonoma County during Red Flag Warnings, the weather service's alerts for hot, dry, windy fire weather. Outages can last for days.
Geyserville through the seasons
- Spring (March–May)
- Spring brings green hills and budding vines, with frost a real risk on clear, still nights on the valley floor.
- Summer (June–August)
- Summer brings hot, dry afternoons with little fog. Mornings start clear more often than in Healdsburg or Windsor.
- Fall (September–November)
- Fall is harvest season and the season of dry offshore winds, which blow from the interior toward the coast and raise the fire danger.
- Winter (December–February)
- Winter is cool and wet, with green hills returning after the first storms and a few frosty mornings between them.
Activities and the weather that matters
- Wine tasting: Comfortable on spring and fall afternoons. In summer, valley-floor patios are best before noon or near sunset.
- Strolling and shopping downtown: The boardwalk block has little shade, so it suits mild days or the cooler ends of a hot one.
- Road cycling in the Alexander Valley: Ride early in summer, since heat builds fast on the open valley floor. Cool, dry fall mornings are the best riding.
Official sources and current conditions
- Sonoma County Tourism: Geyserville
- Sonoma County Emergency: Know Your Zone
- Sonoma County Emergency: Power Shutoffs
- National Weather Service forecast: Geyserville area
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 | 61.8° / 42.7° | 5.8h | 6d | 17.31" | 15 |
| December 2024 | 67 | 59.1° / 43° | 4.6h | 13d | 10.67" | 12 |
| January 2025 | 82 | 60.7° / 38.7° | 7.2h | 9d | 0.55" | 20 |
| February 2025 | 73 | 60.8° / 41.9° | 5.8h | 8d | 13.8" | 15 |
| March 2025 | 78 | 61.9° / 43.4° | 7h | 9d | 5.48" | 18 |
| April 2025 | 87 | 69.7° / 45.8° | 9.1h | 10d | 0.9" | 23 |
| May 2025 | 93 | 80° / 50.2° | 12.5h | 2d | 0.19" | 30 |
| June 2025 | 93 | 82.4° / 50.6° | 12.4h | 3d | 0" | 30 |
| July 2025 | 91 | 83.3° / 52.5° | 11.7h | 7d | 0" | 30 |
| August 2025 | 87 | 90.5° / 54.5° | 11.5h | 2d | 0" | 25 |
| September 2025 | 88 | 84° / 56.3° | 9.5h | 5d | 0.18" | 26 |
| October 2025 | 85 | 73.4° / 50.7° | 7.2h | 11d | 1.17" | 24 |
| November 2025 | 76 | 63.9° / 47.7° | 6.2h | 12d | 5.66" | 12 |
| December 2025 | 61 | 54.2° / 41.8° | 4.5h | 23d | 10.01" | 3 |
| January 2026 | 77 | 61.2° / 40.9° | 6.5h | 7d | 7.93" | 20 |
| February 2026 | 75 | 62.9° / 44.3° | 6h | 7d | 6.84" | 14 |
| March 2026 | 94 | 78.6° / 49.5° | 9.8h | 2d | 0.02" | 31 |
| April 2026 | 86 | 68.9° / 46° | 9h | 3d | 4.89" | 22 |
| May 2026 | 92 | 76.6° / 51.5° | 11.5h | 4d | 0.69" | 31 |
| June 2026 | 91 | 83° / 54.9° | 12.3h | 7d | 0.01" | 29 |
| July 2026 | 88 | 88.2° / 53.8° | 11.7h | 4d | 0.04" | 29 |
| August 2026 | 86 | 88° / 53.5° | 10.7h | 11d | 0" | 27 |
| September 2026 | 88 | 83.7° / 53.1° | 9.8h | 6d | 0.21" | 27 |
| October 2026 | 87 | 80.7° / 48.9° | 8.5h | 2d | 0.09" | 26 |
Climate Trends
Average Temperature by Month
About the Geyserville climate charts
The temperature chart compares average monthly highs and lows at Geyserville, 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 Geyserville. 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 Geyserville, the warmest typical hour is 4 PM in July (91°F). The coldest is 7 AM in December (44°F).
- Fog: Fog or low cloud covers Geyserville in 42% of 5 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. June mornings are the least foggy (13%).
- Wind: From April through September, wind at Geyserville typically builds after 2 PM. In June it peaks around 5 PM, averaging 11 mph with 13% of those hours windy, while mornings average 5 mph.
- Cloud Cover: July middays are the clearest at Geyserville (5% average cloud cover), and December middays are the cloudiest (38%).
- Solar Radiation: The strongest typical sun at Geyserville comes at 1 PM in July, averaging 980 W/m².
How to read the hourly heatmaps for Geyserville
This heatmap shows how average temperature at Geyserville 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 Geyserville. 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 Geyserville 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 Geyserville 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 Geyserville 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 Geyserville
- October 2026 recap: October 2026 at Geyserville averaged a high of 81°F, 7°F warmer than October 2025 (73°F).
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 37.5 in. of rain to Geyserville, 97% of the 38.8 in. normal.
Location Details
Geyserville weather questions
Everything you need to know about weather and visiting Geyserville
What is the weather like at Geyserville today?
It's 55°F at Geyserville right now, with a comfort score of 63 (good). Today's forecast high at Geyserville is 56°F, 9°F below the mid November normal of 65°F. The best window today is 1 PM to 4 PM, at about 50°F with a 3 mph wind (comfort 63).
What is the best month to visit Geyserville?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Geyserville are September, May, and October. The best hours are usually 9 AM to noon in September, 11 AM to 2 PM in May, and 11 AM to 2 PM in October. The warm season lasts about 2.9 months, from Jun 27 to Sep 23, when the average high is 84°F or warmer. Highs peak around Jul 8 at about 87°F.
What are the warmest and coldest months at Geyserville?
July is the warmest month at Geyserville, with an average high of 87°F. December is the coldest, with an average low of 37°F.
When does the fog burn off at Geyserville?
Fog or low cloud covers Geyserville in 42% of 5 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. June mornings are the least foggy (13%).
When is it windiest at Geyserville?
From April through September, wind at Geyserville typically builds after 2 PM. In June it peaks around 5 PM, averaging 11 mph with 13% of those hours windy, while mornings average 5 mph.
How much rain does Geyserville get?
December is the wettest month (8.1 in.), out of about 38.8 in. a year. The rainy season runs from Oct 23 to Apr 25, when a day has at least a 20% chance of measurable rain. That stretch brings 91% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 37.5 in. of rain to Geyserville, 97% of the 38.8 in. normal.
What kind of place is Geyserville?
Geyserville is a small unincorporated town on the floor of the Alexander Valley, about ten minutes north of Healdsburg. The Russian River runs past it on its way south from Mendocino County. Its main street is a short block of 19th-century false-front buildings and wooden boardwalks surrounded by vineyards. The town owes its name to the geothermal springs at The Geysers, high in the Mayacamas Mountains to the east. Those springs drew the tourists who first kept its businesses going.
What is Geyserville weather like in November?
November at Geyserville averages a high of 65°F and a low of 41°F, with 3.9 in. of rain over about 8 rainy days. About 26% of morning hours are foggy. Afternoon wind averages 6 mph.
More about Geyserville 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.
- Sonoma County Tourism, Geyserville (accessed 2026-10-27)
- Sonoma County Tourism, Alexander Valley wine region and appellation (accessed 2026-10-27)
- Sonoma County Emergency Management, Extreme Heat (accessed 2026-10-27)
- Sonoma County Emergency Management (SoCoEmergency) (accessed 2026-10-27)
- Sonoma County Emergency Management, Power Shutoffs (accessed 2026-10-27)
- Lake County News, Kincade fire update: Healdsburg and Windsor ordered to evacuate (Oct. 26, 2019) (accessed 2026-10-27)
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