Vallejo Climate by Month
Vallejo, California, United States
Hot summers and cool winters, with most rain from December to March.
Hot summers and cool winters, with most rain from December to March: that's Vallejo's climate in short. August is the warmest month, with highs around 86°F (30°C); December is the coolest at 57°F (14°C), and nights dip to 40°F (4°C). Of the 26 in (666 mm) of rain in a typical year, 74% falls from December to March. June to September are almost completely dry.
- Warmest month
- 86°F(30°C)
- Average high, August
- Coldest nights
- 40°F(4°C)
- Average low, December
- Rain per year
- 26 in(666 mm)
- Wettest: January
- Humidity
- 65%
- Sunniest: June
Best and worst months in Vallejo
Best for weatherThe most comfortable weather comes in May and October, with highs around 77°F (25°C) and about 1.1 in (28 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 May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Vallejo weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 57°F(14°C) | 40°F(5°C) | 5.4 in(136 mm) | 85% | 1.8 |
| FebFebruary | 63°F(17°C) | 43°F(6°C) | 5.2 in(133 mm) | 74% | 2.6 |
| MarMarch | 67°F(19°C) | 45°F(7°C) | 3.5 in(90 mm) | 66% | 4.2 |
| AprApril | 71°F(22°C) | 46°F(8°C) | 1.5 in(38 mm) | 65% | 5.5 |
| MayMayBest | 77°F(25°C) | 51°F(10°C) | 0.9 in(23 mm) | 60% | 6.4 |
| JunJune | 83°F(28°C) | 54°F(12°C) | 0.2 in(6 mm) | 54% | 7.4 |
| JulJuly | 85°F(30°C) | 56°F(13°C) | 0.0 in(1 mm) | 55% | 7.3 |
| AugAugust | 86°F(30°C) | 56°F(13°C) | 0.0 in(1 mm) | 54% | 6.6 |
| SepSeptember | 84°F(29°C) | 54°F(12°C) | 0.1 in(3 mm) | 58% | 5.4 |
| OctOctoberBest | 78°F(26°C) | 50°F(10°C) | 1.3 in(32 mm) | 59% | 3.8 |
| NovNovember | 66°F(19°C) | 44°F(7°C) | 2.8 in(71 mm) | 68% | 2.5 |
| DecDecember | 57°F(14°C) | 40°F(4°C) | 5.2 in(132 mm) | 77% | 1.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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