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Vallejo Weather by Month
Average temperatures, rainfall and humidity for Vallejo, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Vallejo month looks like before you travel — then check the live Vallejo forecast for the days ahead.
Warmest month
August
28°C average high
Coolest month
December
7°C average low
Wettest month
December
103 mm of rain
Driest month
September
9 mm of rain
Average temperature and rainfall in Vallejo by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 15°C | 7°C | -3°C / 24°C | 85 mm | 77% | 9 km/h |
| February | 17°C | 7°C | -1°C / 27°C | 79 mm | 75% | 10 km/h |
| March | 19°C | 9°C | 1°C / 32°C | 69 mm | 75% | 11 km/h |
| April | 21°C | 10°C | 3°C / 31°C | 41 mm | 73% | 12 km/h |
| May | 23°C | 11°C | 6°C / 37°C | 28 mm | 72% | 14 km/h |
| June | 26°C | 13°C | 9°C / 39°C | 23 mm | 70% | 13 km/h |
| July | 27°C | 14°C | 10°C / 40°C | 14 mm | 72% | 12 km/h |
| August | 28°C | 15°C | 10°C / 39°C | 9 mm | 73% | 12 km/h |
| September | 27°C | 14°C | 9°C / 42°C | 9 mm | 70% | 11 km/h |
| October | 24°C | 12°C | 4°C / 39°C | 25 mm | 67% | 9 km/h |
| November | 19°C | 9°C | 0°C / 28°C | 53 mm | 73% | 8 km/h |
| December | 15°C | 7°C | -2°C / 24°C | 103 mm | 78% | 9 km/h |
Best time to visit Vallejo
The most comfortable time to visit Vallejo is generally May to June and October, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around December, totalling about 539 mm a year.
Travellers who prefer heat should aim for August, when highs average 28°C. December is the month to avoid if rain would spoil your plans — it averages 103 mm, roughly 11× the rainfall of the driest month (September).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Vallejo forecast for what is happening now.
Weather across United States right now
- Atlanta11°C
- Austin16°C
- Baltimore6°C
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- Brooklyn9°C
- Chicago13°C
- Dallas17°C
- Denver12°C
- Detroit7°C
- Houston20°C
- Indianapolis8°C
- Las Vegas15°C
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- Miami22°C
- Minneapolis17°C
- New York9°C
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- Philadelphia6°C
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- Queens9°C
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- Sacramento12°C
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- San Diego15°C
- San Francisco13°C
- San Jose10°C
- Seattle5°C
- St. Louis11°C
- Tampa17°C
- Washington6°C
