Santa Rosa, California Climate by Month
Santa Rosa, California, United States
Warm summers and cool winters, with most rain from December to March.
Santa Rosa has warm summers and cool winters, with most rain from December to March. July is the warmest month, with highs around 85°F (29°C); January is the coolest at 59°F (15°C), and nights dip to 38°F (4°C). Of the 32 in (822 mm) of rain in a typical year, 73% falls from December to March. June to September are almost completely dry.
- Warmest month
- 85°F(29°C)
- Average high, July
- Coldest nights
- 38°F(4°C)
- Average low, December
- Rain per year
- 32 in(822 mm)
- Wettest: February
- Humidity
- 66%
- Sunniest: July
Best and worst months in Santa Rosa
Best for weatherThe most comfortable weather comes in May, with highs around 76°F (25°C) and about 1.2 in (31 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 59°F (15°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)
Santa Rosa weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 59°F(15°C) | 40°F(4°C) | 6.3 in(160 mm) | 83% | 1.8 |
| FebFebruary | 64°F(18°C) | 41°F(5°C) | 6.5 in(165 mm) | 74% | 2.6 |
| MarMarch | 66°F(19°C) | 43°F(6°C) | 4.6 in(116 mm) | 69% | 4.1 |
| AprApril | 71°F(22°C) | 44°F(7°C) | 1.9 in(48 mm) | 68% | 5.3 |
| MayMayBest | 76°F(25°C) | 48°F(9°C) | 1.2 in(31 mm) | 63% | 6.3 |
| JunJune | 83°F(28°C) | 52°F(11°C) | 0.3 in(8 mm) | 57% | 7.2 |
| JulJuly | 85°F(29°C) | 53°F(11°C) | 0.0 in(1 mm) | 58% | 7.3 |
| AugAugust | 85°F(29°C) | 53°F(12°C) | 0.1 in(2 mm) | 58% | 6.5 |
| SepSeptember | 85°F(29°C) | 52°F(11°C) | 0.2 in(4 mm) | 55% | 5.4 |
| OctOctober | 79°F(26°C) | 47°F(8°C) | 1.7 in(43 mm) | 56% | 3.7 |
| NovNovember | 67°F(20°C) | 42°F(5°C) | 3.4 in(87 mm) | 69% | 2.4 |
| DecDecember | 59°F(15°C) | 38°F(4°C) | 6.2 in(157 mm) | 76% | 1.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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