Brentwood, California Climate by Month
Brentwood, California, United States
Hot summers and cool winters, with little rain, mostly from December to March.
The climate in Brentwood is one of hot summers and cool winters, with little rain, mostly from December to March. August is the warmest month, with highs around 91°F (33°C); January is the coolest at 56°F (14°C), and nights dip to 38°F (4°C). It gets only 13 in (320 mm) of rain a year. June to September are almost completely dry.
- Warmest month
- 91°F(33°C)
- Average high, August
- Coldest nights
- 38°F(4°C)
- Average low, December
- Rain per year
- 13 in(320 mm)
- Wettest: January
- Humidity
- 60%
- Sunniest: June
Best and worst months in Brentwood
Best for weatherThe most comfortable weather comes in April, with highs around 74°F (23°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 April.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Brentwood weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 56°F(14°C) | 39°F(4°C) | 2.6 in(67 mm) | 79% | 1.8 |
| FebFebruary | 62°F(17°C) | 42°F(6°C) | 2.3 in(58 mm) | 75% | 2.7 |
| MarMarch | 68°F(20°C) | 45°F(7°C) | 1.6 in(41 mm) | 65% | 4.3 |
| AprAprilBest | 74°F(23°C) | 47°F(8°C) | 1.0 in(25 mm) | 56% | 5.5 |
| MayMay | 80°F(27°C) | 52°F(11°C) | 0.4 in(11 mm) | 50% | 6.5 |
| JunJune | 87°F(31°C) | 57°F(14°C) | 0.2 in(4 mm) | 49% | 7.6 |
| JulJuly | 91°F(33°C) | 58°F(15°C) | 0.0 in(0 mm) | 48% | 7.5 |
| AugAugust | 91°F(33°C) | 58°F(14°C) | 0.0 in(1 mm) | 48% | 6.8 |
| SepSeptember | 89°F(31°C) | 55°F(13°C) | 0.0 in(1 mm) | 49% | 5.6 |
| OctOctober | 80°F(27°C) | 50°F(10°C) | 0.7 in(19 mm) | 52% | 3.9 |
| NovNovember | 67°F(19°C) | 43°F(6°C) | 1.4 in(35 mm) | 68% | 2.6 |
| DecDecember | 57°F(14°C) | 38°F(4°C) | 2.3 in(58 mm) | 80% | 1.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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