Vacaville Climate by Month
Vacaville, California, United States
Hot summers and cool winters, with most rain from December to March.
The climate in Vacaville is one of hot summers and cool winters, with most rain from December to March. August is the warmest month, with highs around 92°F (34°C); January is the coolest at 57°F (14°C), and nights dip to 39°F (4°C). Of the 23 in (596 mm) of rain in a typical year, 77% falls from December to March. June to September are almost completely dry.
- Warmest month
- 92°F(34°C)
- Average high, August
- Coldest nights
- 39°F(4°C)
- Average low, December
- Rain per year
- 23 in(596 mm)
- Wettest: January
- Humidity
- 59%
- Sunniest: July
Best and worst months in Vacaville
Best for weatherApril and May are the best time for weather in Vacaville: highs near 77°F (25°C) and about 1.0 in (25 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 57°F (14°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in April.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Vacaville weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 57°F(14°C) | 39°F(4°C) | 5.3 in(134 mm) | 79% | 1.8 |
| FebFebruary | 62°F(17°C) | 42°F(5°C) | 5.0 in(126 mm) | 68% | 2.6 |
| MarMarch | 67°F(20°C) | 44°F(7°C) | 3.3 in(83 mm) | 66% | 4.2 |
| AprAprilBest | 73°F(23°C) | 46°F(8°C) | 1.2 in(31 mm) | 57% | 5.5 |
| MayMayBest | 80°F(27°C) | 51°F(11°C) | 0.7 in(19 mm) | 51% | 6.4 |
| JunJune | 88°F(31°C) | 56°F(14°C) | 0.2 in(4 mm) | 48% | 7.5 |
| JulJuly | 92°F(33°C) | 58°F(14°C) | 0.0 in(0 mm) | 47% | 7.5 |
| AugAugust | 92°F(34°C) | 57°F(14°C) | 0.0 in(0 mm) | 48% | 6.7 |
| SepSeptember | 89°F(32°C) | 55°F(13°C) | 0.1 in(2 mm) | 48% | 5.5 |
| OctOctober | 80°F(27°C) | 50°F(10°C) | 1.0 in(26 mm) | 52% | 3.9 |
| NovNovember | 67°F(19°C) | 43°F(6°C) | 2.3 in(58 mm) | 68% | 2.5 |
| DecDecember | 57°F(14°C) | 39°F(4°C) | 4.4 in(113 mm) | 79% | 1.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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