Vallejo weather by month
Average highs run from 57°F in January to 79°F in July, and January nights average 38°F. It gets 20 inches of rain and melted snow a year, with almost no snow. The most comfortable months are April to October.
Best time to visit Vallejo
For comfortable weather, go in April to October. In those months the average high stays between 62°F and 86°F, nights average 42°F or warmer, and rain stays under 4.5 inches for the month.
Month by month
| Month | High | Low | Precip. | Snow | Wet days | Days 90°F+ | Nights below 32°F | Feels |
|---|---|---|---|---|---|---|---|---|
| January | 57°F | 38°F | 4.2 in | 0.0 in | 6 | 0 | 9 | cool |
| February | 61°F | 40°F | 4.0 in | 0.0 in | 7 | 0 | 5 | cool |
| March | 64°F | 42°F | 3.0 in | 0.0 in | 6 | 0 | 2 | mild days, chilly nights |
| April | 68°F | 44°F | 1.3 in | 0.0 in | 3 | 0 | 1 | mild |
| May | 73°F | 48°F | 0.8 in | 0.0 in | 2 | 1 | 0 | mild |
| June | 78°F | 52°F | 0.2 in | 0.0 in | 0 | 3 | 0 | warm |
| July | 79°F | 55°F | 0.0 in | 0.0 in | 0 | 2 | 0 | warm |
| August | 80°F | 54°F | 0.0 in | 0.0 in | 0 | 3 | 0 | warm |
| September | 80°F | 51°F | 0.1 in | 0.0 in | 0 | 5 | 0 | warm |
| October | 75°F | 46°F | 0.9 in | 0.0 in | 2 | 2 | 0 | mild |
| November | 65°F | 40°F | 2.0 in | 0.0 in | 4 | 0 | 5 | mild days, chilly nights |
| December | 57°F | 38°F | 3.8 in | 0.0 in | 7 | 0 | 11 | cool |
| Year | 70°F avg | 46°F avg | 20.2 in | 0.0 in | 37 | 16 | 34 |
"Wet days" are days with at least 0.1 inch of precipitation. "Feels" is a plain-language label for the average high. Normals for 1991-2020 from NOAA NCEI, station Napa Co Airport, CA (USW00093227), 7.5 miles from the city center; snowfall from Martinez Wtp, CA. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Vallejo
The shortest day is December 21, with 9h 30m of daylight; the longest is June 21, with 14h 48m. The earliest sunset comes around December 2 (4:48 pm) and the latest around June 21 (8:35 pm). The sun sets after 8 pm on 108 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:24 am | 5:13 pm | 9h 49m |
| February | 6:59 am | 5:47 pm | 10h 49m |
| March | 7:20 am | 7:16 pm | 11h 56m |
| April | 6:33 am | 7:45 pm | 13h 12m |
| May | 5:58 am | 8:12 pm | 14h 14m |
| June | 5:45 am | 8:33 pm | 14h 48m |
| July | 5:58 am | 8:31 pm | 14h 32m |
| August | 6:24 am | 8:01 pm | 13h 37m |
| September | 6:51 am | 7:16 pm | 12h 25m |
| October | 7:18 am | 6:30 pm | 11h 13m |
| November | 6:50 am | 4:56 pm | 10h 06m |
| December | 7:18 am | 4:50 pm | 9h 32m |
Calculated for 2026 at the center of Vallejo with NOAA's solar equations, in local clock time (Pacific Time, including daylight saving time where it applies). Times shift by a minute or two from year to year.
Is Vallejo getting warmer?
The last 10 years averaged 2.3°F warmer than the 20th century. See the climate stripes for Vallejo.Frequently asked questions
What is the warmest month in Vallejo?
September is the warmest month, with an average high of 80°F and an average low of 51°F (NOAA 1991-2020 normals).
What is the coldest month in Vallejo?
December is the coldest, with average lows of 38°F and highs of 57°F.
What is the rainiest month in Vallejo?
January gets the most precipitation, 4.2 inches on average. July is the driest at 0.0 inches.
Does it snow in Vallejo?
Very little. The normal yearly snowfall is under one inch.
When is the best time to visit Vallejo?
For comfortable weather, April to October. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Vallejo?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Vallejo profile.
Compare the weather: Vallejo vs Richmond, Vallejo vs Napa, Vallejo vs Concord, Vallejo vs Fairfield.