Rio Vista Weather
Town • San Francisco Bay Area
Rio Vista is a small river town on the west bank of the Sacramento River at the eastern tip of Solano County. Highway 12 crosses the river there on the Rio Vista lift bridge. Downtown faces the water, the treeless Montezuma Hills and their wind turbines rise to the west, and Delta islands and sloughs spread east and south. Sandy Beach County Park sits just south of town, and Brannan Island State Recreation Area is a few miles down Highway 160. Wind is the town's defining weather, and windsurfers come for it.
Plan your week
10-Day Forecast
Hour by hour
Hourly Forecast
Current Conditions
Comfort Breakdown
Rio Vista weather today and through the year
It's 52°F at Rio Vista right now (feels like 50°F), with 5 mph wind and a comfort score of 76. Monday's forecast high at Rio Vista is 57°F, 8°F below the mid November normal of 65°F. No fog in the forecast for today at Rio Vista. In November, 12% of morning hours here are foggy on average. The best window today is 10 AM to 1 PM, at about 54°F with a 8 mph wind (comfort 61).
July is the warmest month at Rio Vista, with an average high of 91°F. December is the coldest, with an average low of 39°F. January is the wettest month (3.4 in.), out of about 16.2 in. a year. By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Rio Vista are September, October, and June. The best hours are usually 9 AM to noon in September, 11 AM to 2 PM in October, and 9 AM to noon in June.
Rio Vista sits at the far end of the Bay Area's biggest wind tunnel. When the Central Valley heats up, marine air is drawn through San Francisco Bay and the Carquinez Strait and then spreads across the flat Delta toward Sacramento. The Sacramento Municipal Utility District runs a wind farm in the Montezuma Hills next to town. It describes coastal winds that squeeze through the strait and spill into the Delta. Nothing on the open water and low islands slows them down.
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 Rio Vista in the next few days
No active National Weather Service alerts for this location.
Fog
No fog in the forecast for today at Rio Vista. In November, 12% of morning hours here are foggy on average.
Best time to go
The best window today is 10 AM to 1 PM, at about 54°F with a 8 mph wind (comfort 61).
Best day this week
Of the next 7 days, Friday looks best for Rio Vista, with a 61°F high and midday comfort near 79. Wednesday looks weakest (29).
Rain
Next good chance of rain: today (86%, about 0.19 in.).
Live weather map
Weather around Rio Vista right now
Overcast and 52° at Rio Vista right now.
About the live weather map for Rio Vista
The map centers on Rio Vista 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.
Rio Vista vs nearby places
Typical summer conditions compared with Rio Vista, 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 Rio Vista |
|---|---|---|---|---|---|
| Birds Landing | 9.9 mi | -3°F | 3% | 13 mph | a very similar climate |
| Antioch | 12.1 mi | same | 1% | 10 mph | a very similar climate |
| Pittsburg | 13.7 mi | -1°F | 2% | 10 mph | a very similar climate |
| Black Diamond Mines Regional Preserve | 16.5 mi | -5°F | 2% | 14 mph | about 5°F cooler on summer afternoons and windier summer afternoons (14 vs 10 mph) |
| Mount Diablo State Park | 22.5 mi | -12°F | 4% | 10 mph | 3,835 ft higher and about 12°F cooler on summer afternoons |
| Morgan Territory Regional Preserve | 24 mi | -10°F | 11% | 12 mph | about 10°F cooler on summer afternoons and 2,029 ft higher |
Places with a climate like Rio Vista's
Climate Dashboard
Current conditions vs. NOAA normals and recent destination baseline
What the Rio Vista climate comparisons mean
These cards compare recent conditions at Rio Vista 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 Rio Vista 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.
Rio Vista weather by month
July is the warmest month at Rio Vista, with an average high of 91°F. December is the coldest, with an average low of 39°F. January is the wettest month (3.4 in.), out of about 16.2 in. a year. Morning fog peaks in December, when fog or low cloud covers 32% 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 Rio Vista are September, October, and June. The best hours are usually 9 AM to noon in September, 11 AM to 2 PM in October, and 9 AM to noon in June.
| Month | Avg high | Avg low | Rain | Rainy days | Morning fog | Midday cloud | Afternoon wind | Daylight | Comfort |
|---|---|---|---|---|---|---|---|---|---|
| Jan | 56°F | 40°F | 3.4 in | 8 | 29% | 36% | 6 mph | 9.8 h | 55 |
| Feb | 62°F | 43°F | 3.0 in | 7 | 11% | 22% | 8 mph | 10.7 h | 61 |
| Mar | 67°F | 45°F | 2.4 in | 7 | 6% | 25% | 9 mph | 11.9 h | 68 |
| Apr | 72°F | 48°F | 1.1 in | 5 | 4% | 17% | 9 mph | 13.2 h | 79 |
| May | 80°F | 53°F | 0.5 in | 3 | 2% | 10% | 11 mph | 14.3 h | 79 |
| Jun | 87°F | 57°F | 0.1 in | 2 | 0% | 3% | 11 mph | 14.8 h | 81 |
| Jul | 91°F | 59°F | 0.0 in | 0 | 1% | 2% | 10 mph | 14.5 h | 77 |
| Aug | 90°F | 59°F | 0.0 in | 1 | 1% | 2% | 9 mph | 13.6 h | 79 |
| Sep | 88°F | 57°F | 0.1 in | 1 | 1% | 6% | 8 mph | 12.3 h | 83 |
| Oct | 79°F | 52°F | 0.8 in | 4 | 3% | 9% | 7 mph | 11.1 h | 83 |
| Nov | 65°F | 44°F | 1.6 in | 5 | 12% | 22% | 6 mph | 10.0 h | 75 |
| Dec | 56°F | 39°F | 3.2 in | 7 | 32% | 39% | 6 mph | 9.5 h | 52 |
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 Rio Vista's weather different
Among the 163 San Francisco Bay Area towns we track, Rio Vista has the 3rd-least foggy summer mornings.
- #3of 163
least foggy summer morningsamong San Francisco Bay Area towns
When the fog burns off
4 PMwhen December fog usually thins (34% foggy at 8 AM)
Fog or low cloud covers Rio Vista in 34% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by 4 PM. June mornings are the least foggy (0%).
When the wind picks up
4 PMwhen afternoon wind builds, April–June
From April through June, wind at Rio Vista typically builds after 4 PM. In June it peaks around 6 PM, averaging 13 mph with 31% of those hours windy, while mornings average 10 mph.
Hot hours
5 habove 85°F on a typical July afternoon
In July, the average temperature stays at or above 85°F for 5 hours a day.
Daylight
9.5–14.8 hof daylight, Dec to Jun
Days at Rio Vista range from about 9.5 hours in December to 14.8 hours in June. In mid-June the sun sets around 8:31 PM, and in mid-December around 4:52 PM.
Seasons at Rio Vista
- Warm seasonJun 24 – Sep 24 · highs 87°F+
The warm season lasts about 3.1 months, from Jun 24 to Sep 24, when the average high is 87°F or warmer. Highs peak around Jul 8 at about 91°F.
- Hot afternoonsJun 5 – Sep 27 · highs 85°F+
Average highs reach 85°F or more from Jun 5 to Sep 27.
- Cool seasonNov 26 – Feb 27 · highs 64°F or lower
The cool season runs from Nov 26 to Feb 27, when the average high is 64°F or lower. The coldest nights come around Dec 8, with an average low near 39°F.
- Rainy seasonNov 26 – Mar 21 · 70% of the year's rain
The rainy season runs from Nov 26 to Mar 21, when a day has at least a 20% chance of measurable rain. That stretch brings 70% 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 5 and half of its annual total by Jan 24.
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, Rio Vista averaged 46 days a year at 90°F or hotter and 3 nights a year at or below freezing. It averaged 9 days a year with at least half an inch of rain and 3 afternoons with wind of 20 mph or more at 2 PM. About 58 mornings a year had 3 or more hours of fog or low cloud.
In the same record, the hottest day was Aug 3, 2026 (103°F) and the coldest night was Jan 28, 2025 (29°F). The wettest day was Nov 23, 2024 (1.38 in.), and the strongest 2 PM gust was 46 mph on Feb 4, 2025.
- 46days at 90°F or hotter
- 3nights at or below freezing
- 9days with ½ in. of rain or more
- 3afternoons with 20+ mph wind
- 58mornings with 3+ hours of fog or low cloud
- Hottest day103°FAug 3, 2026
- Coldest night29°FJan 28, 2025
- Wettest day1.38 inNov 23, 2024
- Strongest 2 PM gust46 mphFeb 4, 2025
What shapes Rio Vista's weather
Marine air has warmed a lot by the time it reaches Rio Vista, so the town is hot in summer, much hotter than Benicia. The steady Delta breeze, the ocean wind that flows in through the strait, makes the heat easier to take. State Parks says that breeze is never far away at nearby Brannan Island. Occasional heat waves still push summer afternoons into the triple digits when the wind fails.
Strong surges of ocean air through the Delta can drop temperatures sharply in a day and arrive with gusty winds. On calm winter nights, tule fog, a dense ground fog of the Central Valley, forms over the river and farmland. Fog in this part of the Delta can be thick and slow to clear, which matters on Highway 12 and on the river.
Tips for visiting Rio Vista
Don't swim at Sandy Beach
Solano County prohibits swimming at Sandy Beach because of strong currents and sudden drop-offs, and no lifeguard is on duty.
Bring windsurf gear, not an umbrella
Sandy Beach and Brannan Island both list windsurfing among their activities, and the Delta breeze rarely stops in summer.
Camp by the river
Sandy Beach has a 42-site campground with electric and water hookups, and pets on leash are welcome in the campground but not the day use area.
Keep Brannan Island dogs on the pavement
At Brannan Island, leashed dogs are limited to paved roads and campsites and are not allowed on most trails or beaches.
Watch for sudden wind shifts
Strong surges of ocean air through the Carquinez Strait and the Delta can arrive suddenly with gusty winds and a sharp drop in temperature.
Rio Vista through the seasons
- Spring (March–May)
- Wind picks up as the valley warms, and the green Montezuma Hills make the drive in along Highway 12 worth it.
- Summer (June–August)
- Summer is hot and breezy, with the best windsurfing of the year. The occasional heat wave pushes past 100°F.
- Fall (September–October)
- Fall brings warm days, lighter winds, and good fishing weather on the river.
- Winter (November–February)
- Winter is cool and brings most of the year's rain, though totals here are light for the Bay Area. Tule fog forms on calm nights. Drive Highway 12 with care when fog is thick.
Activities and the weather that matters
- Windsurfing: Windsurfing is best on hot summer afternoons, when the Delta breeze through the Carquinez Strait is strongest.
- Boating and fishing on the Sacramento River: Calm mornings are easiest. Afternoon wind builds chop on the river in summer.
- Camping at Brannan Island or Sandy Beach: Spring and fall are most comfortable. Summer days are hot, so expect wind in camp as well.
Official sources and current conditions
- Solano County: Sandy Beach Park and Campground
- California State Parks: Brannan Island State Recreation Area
- Discover Rio Vista
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 | 81 | 62.4° / 43° | 6.2h | 4d | 2.34" | 18 |
| December 2024 | 69 | 57.5° / 42.5° | 4.3h | 15d | 3.26" | 10 |
| January 2025 | 83 | 59.3° / 37.2° | 7.2h | 2d | 0.11" | 26 |
| February 2025 | 80 | 61.4° / 43.5° | 7h | 1d | 4.18" | 20 |
| March 2025 | 88 | 64° / 45.1° | 8.4h | 1d | 1.05" | 26 |
| April 2025 | 94 | 71.6° / 49.3° | 10.1h | 1d | 0.33" | 28 |
| May 2025 | 93 | 80.5° / 54.5° | 12.5h | 0d | 0.09" | 29 |
| June 2025 | 94 | 83.4° / 56.5° | 12.9h | 0d | 0" | 30 |
| July 2025 | 93 | 83.7° / 57.9° | 12.5h | 0d | 0" | 31 |
| August 2025 | 88 | 90.3° / 61.3° | 11.5h | 0d | 0" | 25 |
| September 2025 | 91 | 85.1° / 61.8° | 9.9h | 0d | 0.15" | 28 |
| October 2025 | 90 | 74.1° / 53.5° | 7.9h | 3d | 1.71" | 27 |
| November 2025 | 75 | 62.8° / 48.8° | 4.8h | 10d | 2.32" | 15 |
| December 2025 | 56 | 51.8° / 43.8° | 2.8h | 23d | 2.47" | 2 |
| January 2026 | 70 | 56.8° / 40.4° | 6h | 17d | 2.72" | 8 |
| February 2026 | 80 | 63.6° / 44.2° | 6.8h | 6d | 3.39" | 20 |
| March 2026 | 95 | 77.6° / 52.1° | 9.9h | 0d | 0" | 31 |
| April 2026 | 89 | 70.1° / 49.5° | 9.4h | 2d | 3.08" | 24 |
| May 2026 | 93 | 77.6° / 54.6° | 11.7h | 0d | 0.47" | 31 |
| June 2026 | 93 | 84.5° / 58.7° | 13h | 0d | 0" | 29 |
| July 2026 | 91 | 88.1° / 60.3° | 12.2h | 0d | 0" | 29 |
| August 2026 | 92 | 88.8° / 60.2° | 11.2h | 0d | 0" | 29 |
| September 2026 | 93 | 84° / 57.6° | 10.5h | 0d | 0" | 28 |
| October 2026 | 88 | 79.7° / 54° | 8.4h | 2d | 0.28" | 26 |
Climate Trends
Average Temperature by Month
About the Rio Vista climate charts
The temperature chart compares average monthly highs and lows at Rio Vista, 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 Rio Vista. 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 Rio Vista, the warmest typical hour is 4 PM in July (91°F). The coldest is 7 AM in January (42°F).
- Fog: Fog or low cloud covers Rio Vista in 34% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by 4 PM. June mornings are the least foggy (0%).
- Wind: From April through June, wind at Rio Vista typically builds after 4 PM. In June it peaks around 6 PM, averaging 13 mph with 31% of those hours windy, while mornings average 10 mph.
- Cloud Cover: July middays are the clearest at Rio Vista (2% average cloud cover), and December middays are the cloudiest (39%).
- Solar Radiation: The strongest typical sun at Rio Vista comes at 1 PM in June, averaging 1003 W/m².
How to read the hourly heatmaps for Rio Vista
This heatmap shows how average temperature at Rio Vista 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 Rio Vista. 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 Rio Vista 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 Rio Vista 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 Rio Vista 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 Rio Vista
- October 2026 recap: October 2026 at Rio Vista averaged a high of 80°F, 6°F warmer than October 2025 (74°F).
- Rain year: The 2025-26 rain year (Oct. 1 to Sep. 30) brought 16.2 in. of rain to Rio Vista, 100% of the 16.2 in. normal.
Location Details
Rio Vista weather questions
Everything you need to know about weather and visiting Rio Vista
What is the weather like at Rio Vista today?
It's 52°F at Rio Vista right now, with a comfort score of 76 (great). Monday's forecast high at Rio Vista is 57°F, 8°F below the mid November normal of 65°F. The best window today is 10 AM to 1 PM, at about 54°F with a 8 mph wind (comfort 61).
What is the best month to visit Rio Vista?
By typical temperature, wind, cloud, humidity, and rain odds, the most comfortable months at Rio Vista are September, October, and June. The best hours are usually 9 AM to noon in September, 11 AM to 2 PM in October, and 9 AM to noon in June. The warm season lasts about 3.1 months, from Jun 24 to Sep 24, when the average high is 87°F or warmer. Highs peak around Jul 8 at about 91°F.
What are the warmest and coldest months at Rio Vista?
July is the warmest month at Rio Vista, with an average high of 91°F. December is the coldest, with an average low of 39°F.
When does the fog burn off at Rio Vista?
Fog or low cloud covers Rio Vista in 34% of 8 AM hours in December, the foggiest month. It usually thins to a third of that by 4 PM. June mornings are the least foggy (0%).
When is it windiest at Rio Vista?
From April through June, wind at Rio Vista typically builds after 4 PM. In June it peaks around 6 PM, averaging 13 mph with 31% of those hours windy, while mornings average 10 mph.
How much rain does Rio Vista get?
January is the wettest month (3.4 in.), out of about 16.2 in. a year. The rainy season runs from Nov 26 to Mar 21, when a day has at least a 20% chance of measurable rain. That stretch brings 70% of the year's rain. The 2025-26 rain year (Oct. 1 to Sep. 30) brought 16.2 in. of rain to Rio Vista, 100% of the 16.2 in. normal.
What kind of place is Rio Vista?
Rio Vista is a small river town on the west bank of the Sacramento River at the eastern tip of Solano County. Highway 12 crosses the river there on the Rio Vista lift bridge. Downtown faces the water, the treeless Montezuma Hills and their wind turbines rise to the west, and Delta islands and sloughs spread east and south. Sandy Beach County Park sits just south of town, and Brannan Island State Recreation Area is a few miles down Highway 160. Wind is the town's defining weather, and windsurfers come for it.
What is Rio Vista weather like in November?
November at Rio Vista averages a high of 65°F and a low of 44°F, with 1.6 in. of rain over about 5 rainy days. About 12% of morning hours are foggy. Afternoon wind averages 6 mph.
More about Rio Vista 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.
- Solano County, Sandy Beach Park and Campground (accessed 2026-10-27)
- California State Parks, Brannan Island State Recreation Area (accessed 2026-10-27)
- SMUD, Power Sources (Solano wind farm, Montezuma Hills) (accessed 2026-10-27)
- NWS Western Region Technical Attachment 95-21, Forecasting Marine Air Intrusions into the Sacramento Valley (Sept 1995) (accessed 2026-10-27)
Rendered 2026-11-15T12:16:27.320Z.