Click on a day for an hourly weather forecast
The temperatures in Vallejo in August are comfortable with low of 14°C and and high up to 27°C.
There is little to no rain in Vallejo during August, so it’s a lot easier to explore the city. Just remember to dress in warm layers, as it can still get pretty chilly.
Our weather forecast can give you a great sense of what weather to expect in Vallejo in August 2025.
If you’re planning to visit Vallejo in the near future, we highly recommend that you review the 14 day weather forecast for Vallejo before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 6° | 5 | 27 | 0 | 59 mm | Good | Vallejo in January |
| February | 16° / 7° | 4 | 24 | 0 | 60 mm | Good | Vallejo in February |
| March | 17° / 7° | 5 | 26 | 0 | 58 mm | Good | Vallejo in March |
| April | 20° / 8° | 2 | 28 | 0 | 22 mm | Good | Vallejo in April |
| May | 22° / 10° | 1 | 30 | 0 | 13 mm | Good | Vallejo in May |
| June | 26° / 13° | 0 | 30 | 0 | 5 mm | Perfect | Vallejo in June |
| July | 27° / 13° | 0 | 31 | 0 | 2 mm | Perfect | Vallejo in July |
| August | 27° / 14° | 0 | 31 | 0 | 2 mm | Perfect | Vallejo in August |
| September | 28° / 15° | 0 | 30 | 0 | 3 mm | Perfect | Vallejo in September |
| October | 24° / 13° | 2 | 29 | 0 | 26 mm | Perfect | Vallejo in October |
| November | 18° / 9° | 3 | 27 | 0 | 35 mm | Good | Vallejo in November |
| December | 14° / 7° | 5 | 26 | 0 | 48 mm | Good | Vallejo in December |