Fairfield, California Climate by Month
Fairfield, 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 Fairfield's climate in short. Expect highs of 88°F (31°C) in August and 56°F (14°C) in January, with the coldest nights (December) near 39°F (4°C). It gets 21 in (536 mm) of rain a year, 75% of it from December to March. June to September are almost completely dry.
- Warmest month
- 88°F(31°C)
- Average high, August
- Coldest nights
- 39°F(4°C)
- Average low, December
- Rain per year
- 21 in(536 mm)
- Wettest: January
- Humidity
- 63%
- Sunniest: July
Best and worst months in Fairfield
Best for weatherThe most comfortable weather comes in April, May and October, with highs around 76°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 56°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)
Fairfield weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 56°F(14°C) | 39°F(4°C) | 4.6 in(118 mm) | 79% | 1.8 |
| FebFebruary | 62°F(17°C) | 42°F(6°C) | 4.3 in(110 mm) | 75% | 2.7 |
| MarMarch | 67°F(19°C) | 44°F(7°C) | 2.8 in(72 mm) | 66% | 4.2 |
| AprAprilBest | 73°F(23°C) | 47°F(8°C) | 1.2 in(30 mm) | 63% | 5.5 |
| MayMayBest | 78°F(26°C) | 51°F(11°C) | 0.7 in(18 mm) | 58% | 6.4 |
| JunJune | 85°F(29°C) | 55°F(13°C) | 0.2 in(4 mm) | 52% | 7.5 |
| JulJuly | 87°F(31°C) | 55°F(13°C) | 0.0 in(0 mm) | 54% | 7.5 |
| AugAugust | 88°F(31°C) | 55°F(13°C) | 0.0 in(1 mm) | 53% | 6.7 |
| SepSeptember | 86°F(30°C) | 54°F(12°C) | 0.1 in(2 mm) | 52% | 5.5 |
| OctOctoberBest | 78°F(26°C) | 50°F(10°C) | 1.0 in(26 mm) | 54% | 3.9 |
| NovNovember | 66°F(19°C) | 43°F(6°C) | 2.1 in(54 mm) | 69% | 2.5 |
| DecDecember | 57°F(14°C) | 39°F(4°C) | 4.0 in(101 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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