Climate
Vallejo weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: May, June, October, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Wet days |
|---|---|---|---|---|
| January | 57°F | 42°F | 4.5 in | – |
| February | 63°F | 45°F | 3.6 in | – |
| March | 68°F | 46°F | 3.2 in | – |
| April | 73°F | 47°F | 1.4 in | – |
| May | 78°F | 51°F | 0.80 in | – |
| June | 83°F | 54°F | 0.20 in | – |
| July | 85°F | 56°F | 0.00 in | – |
| August | 86°F | 56°F | 0.00 in | – |
| September | 86°F | 57°F | 0.10 in | – |
| October | 79°F | 54°F | 1.0 in | – |
| November | 66°F | 47°F | 2.2 in | – |
| December | 58°F | 42°F | 4.5 in | – |
NOAA U.S. Climate Normals 1991–2020, Vallejo, Ca Us (2.8 mi away, 341 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in Vallejo?
September, with an average high of 86°F and low of 57°F.
What is the coldest month in Vallejo?
January, with an average low of 42°F and high of 57°F.
When does it rain most in Vallejo?
January is the wettest month, averaging 4.5 in of precipitation; the year totals about 21.5 inches.
What is the best time to visit Vallejo?
For mild weather (highs between 65°F and 85°F) with the least rain, May, June, October.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the Vallejo weather station, 2.8 miles from downtown: 30-year averages, not a forecast.