Click on a day for an hourly weather forecast
The weather in Vacaville in August is hot. The average temperatures are between 15°C and 33°C. Usually the days in August are hot while the nights are a bit cooler.
You can expect up to 3 rainy days in Vacaville during the month of August.
Our weather forecast can give you a great sense of what weather to expect in Vacaville in August 2025.
If you’re planning to visit Vacaville in the near future, we highly recommend that you review the 14 day weather forecast for Vacaville before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 14° / 5° | 6 | 25 | 0 | 106 mm | Good | Vacaville in January |
| February | 16° / 6° | 5 | 23 | 0 | 82 mm | Good | Vacaville in February |
| March | 18° / 7° | 6 | 25 | 0 | 95 mm | Good | Vacaville in March |
| April | 22° / 9° | 3 | 27 | 0 | 28 mm | Good | Vacaville in April |
| May | 26° / 11° | 2 | 29 | 0 | 16 mm | Perfect | Vacaville in May |
| June | 31° / 14° | 1 | 29 | 0 | 5 mm | Good | Vacaville in June |
| July | 33° / 15° | 0 | 31 | 0 | 1 mm | Good | Vacaville in July |
| August | 33° / 15° | 0 | 31 | 0 | 0 mm | Good | Vacaville in August |
| September | 32° / 16° | 1 | 30 | 0 | 4 mm | Good | Vacaville in September |
| October | 26° / 13° | 2 | 29 | 0 | 35 mm | Perfect | Vacaville in October |
| November | 18° / 8° | 4 | 26 | 0 | 46 mm | Good | Vacaville in November |
| December | 13° / 5° | 6 | 25 | 0 | 98 mm | Ok | Vacaville in December |