Vallejo Weather
Town • San Francisco Bay Area
Downtown Vallejo faces Mare Island across the Mare Island Strait, the last reach of the Napa River before it empties into San Pablo Bay. The waterfront along Mare Island Way holds the ferry terminal to San Francisco and the visitor center. Across the strait is the old Mare Island Naval Shipyard, the Navy's first West Coast station, which ran from 1854 until 1996. A mile or two south, the bay narrows into the Carquinez Strait, the sea-level gap that leads east to the Central Valley.
Plan your week
10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
Vallejo weather today and through the year
It's 54°F at Vallejo right now (feels like 52°F), with 5 mph wind and a comfort score of 78. Monday's forecast high at Vallejo is 56°F, 8°F below the mid November normal of 64°F. No fog in the forecast for today at Vallejo. In November, 17% of morning hours here are foggy on average. The best window today is 9 AM to noon, at about 54°F with a 5 mph wind (comfort 55).
August is the warmest month at Vallejo, with an average high of 76°F. December is the coldest, with an average low of 42°F. January is the wettest month (4.4 in.), out of about 21.5 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Vallejo are September, July, and August. The best hours are usually 11 AM to 2 PM in September, noon to 3 PM in July, and 11 AM to 2 PM in August.
Vallejo's weather is set by the Carquinez Strait, the narrow water gap just south of town. It is the main sea-level opening between the Bay Area and the Central Valley. On summer afternoons, as the valley heats up, cooler air from San Pablo Bay is pulled east through the strait, and Vallejo sits right at its western mouth. That steady westerly breeze keeps the waterfront noticeably cooler than Fairfield or Napa, only a short drive inland.
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 Vallejo in the next few days
No active National Weather Service alerts for this location.
Fog
No fog in the forecast for today at Vallejo. In November, 17% of morning hours here are foggy on average.
Best time to go
The best window today is 9 AM to noon, at about 54°F with a 5 mph wind (comfort 55).
Best day this week
Of the next 7 days, Friday looks best for Vallejo, with a 61°F high and midday comfort near 81. Today looks weakest (52).
Rain
Next good chance of rain: today (71%, about 0.41 in.).
Live weather map
Weather around Vallejo right now
Overcast and 54° at Vallejo right now.
About the live weather map for Vallejo
The map centers on Vallejo 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.
Vallejo vs nearby places
Typical summer conditions compared with Vallejo, 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 Vallejo |
|---|---|---|---|---|---|
| American Canyon | 4.9 mi | same | 20% | 11 mph | a very similar climate |
| Benicia | 6.5 mi | +4°F | 11% | 12 mph | about 4°F warmer on summer afternoons and windier summer afternoons (12 vs 9 mph) |
| Martinez | 8.9 mi | +4°F | 10% | 12 mph | about 4°F warmer on summer afternoons |
| Crissy Field | 23.5 mi | -20°F | 40% | 18 mph | about 20°F cooler on summer afternoons and windier summer afternoons (18 vs 9 mph) |
| Rodeo Beach | 24.2 mi | -21°F | 48% | 13 mph | about 21°F cooler on summer afternoons and more summer morning fog (48% vs 18% of morning hours) |
| Baker Beach | 24.8 mi | -21°F | 45% | 16 mph | about 21°F cooler on summer afternoons and more summer morning fog (45% vs 18% of morning hours) |
Places with a climate like Vallejo's
- Don Edwards Wildlife Refuge (43 mi away): nearly the same temperatures every month
- Coyote Hills Regional Park (39 mi away): nearly the same temperatures every month
- Newark (41 mi away): similar temperatures through the year
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Vallejo climate comparisons mean
These cards compare recent conditions at Vallejo 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 Vallejo 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.
Vallejo weather by month
August is the warmest month at Vallejo, with an average high of 76°F. December is the coldest, with an average low of 42°F. January is the wettest month (4.4 in.), out of about 21.5 in. a year. Morning fog peaks in December, when fog or low cloud covers 27% of the hours from 6 to 10 AM. June 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 Vallejo are September, July, and August. The best hours are usually 11 AM to 2 PM in September, noon to 3 PM in July, and 11 AM to 2 PM in August.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 57°F | 43°F | 4.4 in | 9 | 23% | 34% | 6 mph | 9.8 h | 59 |
| Feb | 61°F | 45°F | 4.1 in | 8 | 13% | 25% | 7 mph | 10.7 h | 63 |
| Mar | 64°F | 47°F | 3.3 in | 7 | 14% | 29% | 8 mph | 11.9 h | 66 |
| Apr | 67°F | 48°F | 1.4 in | 5 | 10% | 23% | 9 mph | 13.2 h | 77 |
| May | 70°F | 52°F | 0.7 in | 3 | 11% | 20% | 10 mph | 14.2 h | 79 |
| Jun | 75°F | 55°F | 0.2 in | 2 | 13% | 11% | 10 mph | 14.8 h | 85 |
| Jul | 75°F | 56°F | 0.0 in | 0 | 22% | 12% | 9 mph | 14.5 h | 87 |
| Aug | 76°F | 56°F | 0.0 in | 1 | 20% | 13% | 9 mph | 13.6 h | 87 |
| Sep | 76°F | 56°F | 0.1 in | 1 | 17% | 15% | 8 mph | 12.3 h | 89 |
| Oct | 72°F | 53°F | 1.0 in | 4 | 17% | 17% | 7 mph | 11.1 h | 83 |
| Nov | 64°F | 47°F | 2.3 in | 6 | 17% | 23% | 5 mph | 10.0 h | 70 |
| Dec | 57°F | 42°F | 4.0 in | 8 | 27% | 37% | 6 mph | 9.5 h | 56 |
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 Vallejo's weather different
When the fog burns off
1 PMwhen December fog usually thins (32% foggy at 6 AM)
Fog or low cloud covers Vallejo in 32% of 6 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. April mornings are the least foggy (10%).
When the wind picks up
noonwhen afternoon wind builds, February–October
From February through October, wind at Vallejo typically builds after noon. In May it peaks around 4 PM, averaging 11 mph with 5% of those hours windy, while mornings average 5 mph.
Microclimate
+4°FBenicia, 6.5 mi away, on summer afternoons
Benicia, 6.5 miles away, runs about 4°F warmer than Vallejo on summer afternoons.
Daylight
9.5–14.8 hof daylight, Dec to Jun
Days at Vallejo range from about 9.5 hours in December to 14.8 hours in June. In mid-June the sun sets around 8:33 PM, and in mid-December around 4:54 PM.
Seasons at Vallejo
- Warm seasonJun 8 – Sep 26 · highs 75°F+
The warm season lasts about 3.7 months, from Jun 8 to Sep 26, when the average high is 75°F or warmer. Highs peak around Aug 8 at about 76°F.
- Cool seasonNov 28 – Feb 28 · highs 62°F or lower
The cool season runs from Nov 28 to Feb 28, when the average high is 62°F or lower. The coldest nights come around Dec 8, with an average low near 42°F.
- Rainy seasonNov 12 – Apr 2 · 81% of the year's rain
The rainy season runs from Nov 12 to Apr 2, when a day has at least a 20% chance of measurable rain. That stretch brings 81% 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 31 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, Vallejo averaged 7 days a year at 90°F or hotter and 1 night a year at or below freezing. It averaged 16 days a year with at least half an inch of rain and 1 afternoon with wind of 20 mph or more at 2 PM. About 98 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Sep 9, 2026 (97°F) and the coldest night was Feb 10, 2025 (31°F). The wettest day was Nov 23, 2024 (2.06 in.), and the strongest 2 PM gust was 42 mph on Feb 4, 2025.
- 7days at 90°F or hotter
- 1night at or below freezing
- 16days with ½ in. of rain or more
- 1afternoon with 20+ mph wind
- 98mornings with 3+ hours of fog or low cloud
- Hottest day97°FSep 9, 2026
- Coldest night31°FFeb 10, 2025
- Wettest day2.06 inNov 23, 2024
- Strongest 2 PM gust42 mphFeb 4, 2025
What shapes Vallejo's weather
Vallejo lies far from the open ocean, so the summer fog that blankets San Francisco usually thins out before it gets here. Mornings can start with low clouds off the bay, but most summer days turn sunny. When the sea breeze weakens during a heat wave, Vallejo gets hot much faster than San Francisco or Oakland.
In winter the Carquinez Strait works in reverse. On calm, cold mornings, tule fog, the dense ground fog that forms in the Central Valley, can drift west through the strait and settle over the waterfront. Winter storms bring most of the year's rain, though Vallejo gets less than the hills of Marin to the west.
Tips for visiting Vallejo
Ride the ferry to San Francisco
San Francisco Bay Ferry serves Vallejo. The crossing of San Pablo Bay is breezy on the outside deck, so bring a layer even on hot days.
Start at the waterfront visitor center
Visit Vallejo's visitor center is at 289 Mare Island Way, Suite A, along the downtown waterfront.
Tour Mare Island's shipyard history
The Mare Island Historic Park Foundation leads guided tours that include St. Peter's Chapel, Alden Park, and the historic dry dock.
Sign up for city emergency alerts
Vallejo's alert system sends time-sensitive messages about severe weather, road closures, and evacuations to phones, email, or text.
Walk the waterfront in the evening
On hot days the breeze off the strait makes the waterfront the most comfortable place in town from late afternoon into the evening.
Vallejo through the seasons
- Spring (March–May)
- Spring brings green hills, mild days, and an afternoon west wind that builds as the Central Valley warms.
- Summer (June–August)
- Summer is warm and mostly sunny, with a steady afternoon breeze off San Pablo Bay. Heat waves hit harder here than in San Francisco or Oakland when the breeze fails.
- Fall (September–October)
- September is as warm as August. Heat waves come when the sea breeze weakens and offshore winds bring dry air and sometimes wildfire smoke from the north.
- Winter (November–February)
- Winter is the rainy season, with occasional tule fog drifting in through the Carquinez Strait on calm, cold mornings.
Activities and the weather that matters
- Ferry trips: Calm mornings give the smoothest ride. Afternoon west wind kicks up chop on San Pablo Bay, and the outside deck gets cold fast.
- Mare Island history and trails: Mare Island is pleasant most of the year. The island is open to the wind off the bay, so summer afternoons are breezy rather than hot.
- Waterfront walks and sunset watching: Walks are best on clear evenings. A jacket helps once the westerly wind picks up.
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 | 80 | 63.4° / 46.2° | 6.3h | 3d | 3.85" | 21 |
| December 2024 | 69 | 58.3° / 45.3° | 4.7h | 13d | 5" | 12 |
| January 2025 | 82 | 60.4° / 41.6° | 6.9h | 7d | 0.17" | 19 |
| February 2025 | 75 | 61.1° / 43.8° | 6.4h | 3d | 6.61" | 16 |
| March 2025 | 83 | 62.5° / 46.6° | 7.9h | 1d | 1.73" | 19 |
| April 2025 | 91 | 66.6° / 49.8° | 9.7h | 1d | 0.18" | 29 |
| May 2025 | 95 | 73.4° / 53.2° | 11.8h | 1d | 0.12" | 31 |
| June 2025 | 94 | 72.7° / 53.9° | 12h | 3d | 0" | 30 |
| July 2025 | 93 | 72.4° / 56.3° | 11.5h | 4d | 0" | 31 |
| August 2025 | 93 | 79.6° / 58.6° | 11.1h | 1d | 0" | 31 |
| September 2025 | 90 | 77.1° / 60.7° | 9.1h | 2d | 0.26" | 27 |
| October 2025 | 86 | 72.1° / 54.3° | 7.5h | 7d | 0.79" | 23 |
| November 2025 | 78 | 63.8° / 50.6° | 6.3h | 11d | 2.59" | 15 |
| December 2025 | 62 | 54.2° / 45° | 4.8h | 17d | 3.87" | 4 |
| January 2026 | 78 | 60.1° / 44.2° | 6.4h | 3d | 3.2" | 21 |
| February 2026 | 79 | 63.8° / 47° | 6.5h | 5d | 3.71" | 16 |
| March 2026 | 94 | 76.1° / 52.2° | 9.7h | 2d | 0.02" | 29 |
| April 2026 | 87 | 68.2° / 50.9° | 9h | 4d | 2.79" | 23 |
| May 2026 | 93 | 71.6° / 54.1° | 11.3h | 3d | 0.49" | 31 |
| June 2026 | 94 | 75.4° / 56.6° | 12.3h | 3d | 0" | 30 |
| July 2026 | 93 | 77.2° / 57.8° | 11.4h | 5d | 0" | 31 |
| August 2026 | 91 | 76.3° / 58.1° | 10.5h | 6d | 0" | 31 |
| September 2026 | 90 | 76.6° / 57.6° | 9.5h | 7d | 0.22" | 28 |
| October 2026 | 90 | 76° / 52.8° | 8.2h | 2d | 0.31" | 29 |
Climate Trends
Average Temperature by Month
About the Vallejo climate charts
The temperature chart compares average monthly highs and lows at Vallejo, 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 Vallejo. 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 Vallejo, the warmest typical hour is 4 PM in August (80°F). The coldest is 7 AM in February (44°F).
- Fog: Fog or low cloud covers Vallejo in 32% of 6 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. April mornings are the least foggy (10%).
- Wind: From February through October, wind at Vallejo typically builds after noon. In May it peaks around 4 PM, averaging 11 mph with 5% of those hours windy, while mornings average 5 mph.
- Cloud Cover: June middays are the clearest at Vallejo (11% average cloud cover), and December middays are the cloudiest (37%).
- Solar Radiation: The strongest typical sun at Vallejo comes at 1 PM in June, averaging 983 W/m².
How to read the hourly heatmaps for Vallejo
This heatmap shows how average temperature at Vallejo 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 Vallejo. 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 Vallejo 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 Vallejo 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 Vallejo 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 Vallejo
- October 2026 recap: October 2026 at Vallejo averaged a high of 76°F, 4°F warmer than the 1991-2020 normal of 72°F. It brought 0.31 in. of rain, compared with a normal of 1.03 in.
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 17.7 in. of rain to Vallejo, 82% of the 21.5 in. normal.
Location Details
Vallejo weather questions
Everything you need to know about weather and visiting Vallejo
What is the weather like at Vallejo today?
It's 54°F at Vallejo right now, with a comfort score of 78 (great). Monday's forecast high at Vallejo is 56°F, 8°F below the mid November normal of 64°F. The best window today is 9 AM to noon, at about 54°F with a 5 mph wind (comfort 55).
What is the best month to visit Vallejo?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Vallejo are September, July, and August. The best hours are usually 11 AM to 2 PM in September, noon to 3 PM in July, and 11 AM to 2 PM in August. The warm season lasts about 3.7 months, from Jun 8 to Sep 26, when the average high is 75°F or warmer. Highs peak around Aug 8 at about 76°F.
What are the warmest and coldest months at Vallejo?
August is the warmest month at Vallejo, with an average high of 76°F. December is the coldest, with an average low of 42°F.
When does the fog burn off at Vallejo?
Fog or low cloud covers Vallejo in 32% of 6 AM hours in December, the foggiest month. It usually thins to a third of that by 1 PM. April mornings are the least foggy (10%).
When is it windiest at Vallejo?
From February through October, wind at Vallejo typically builds after noon. In May it peaks around 4 PM, averaging 11 mph with 5% of those hours windy, while mornings average 5 mph.
How much rain does Vallejo get?
January is the wettest month (4.4 in.), out of about 21.5 in. a year. The rainy season runs from Nov 12 to Apr 2, when a day has at least a 20% chance of measurable rain. That stretch brings 81% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 17.7 in. of rain to Vallejo, 82% of the 21.5 in. normal.
How does Vallejo weather compare with Benicia?
Benicia, 6.5 miles away, runs about 4°F warmer than Vallejo on summer afternoons.
What kind of place is Vallejo?
Downtown Vallejo faces Mare Island across the Mare Island Strait, the last reach of the Napa River before it empties into San Pablo Bay. The waterfront along Mare Island Way holds the ferry terminal to San Francisco and the visitor center. Across the strait is the old Mare Island Naval Shipyard, the Navy's first West Coast station, which ran from 1854 until 1996. A mile or two south, the bay narrows into the Carquinez Strait, the sea-level gap that leads east to the Central Valley.
What is Vallejo weather like in November?
November at Vallejo averages a high of 64°F and a low of 47°F, with 2.3 in. of rain over about 6 rainy days. About 17% of morning hours are foggy. Afternoon wind averages 5 mph.
More about Vallejo 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.
- Visit Vallejo, San Francisco Bay Ferry listing (accessed 2026-10-27)
- Visit Vallejo, home page (accessed 2026-10-27)
- City of Vallejo, Mare Island (accessed 2026-10-27)
- City of Vallejo, home page (Emergency Alert System) (accessed 2026-10-27)
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