San Rafael, California Climate by Month
San Rafael, California, United States
Warm summers and mild winters, with most rain from December to March.
San Rafael has warm summers and mild winters, with most rain from December to March. Expect highs of 81°F (27°C) in August and 57°F (14°C) in January, with the coldest nights (January) near 42°F (6°C). Of the 42 in (1057 mm) of rain in a typical year, 74% falls from December to March. June to September are almost completely dry.
- Warmest month
- 81°F(27°C)
- Average high, August
- Coldest nights
- 42°F(6°C)
- Average low, January
- Rain per year
- 42 in(1057 mm)
- Wettest: December
- Humidity
- 68%
- Sunniest: June
Best and worst months in San Rafael
Best for weatherThe most comfortable weather comes in May, June and October, with highs around 75°F (24°C) and about 1.1 in (29 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 June.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Rafael weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 57°F(14°C) | 42°F(6°C) | 8.0 in(204 mm) | 83% | 1.8 |
| FebFebruary | 61°F(16°C) | 44°F(7°C) | 7.9 in(200 mm) | 74% | 2.6 |
| MarMarch | 65°F(18°C) | 45°F(7°C) | 5.5 in(140 mm) | 68% | 4.2 |
| AprApril | 68°F(20°C) | 46°F(8°C) | 2.7 in(69 mm) | 69% | 5.4 |
| MayMayBest | 73°F(23°C) | 49°F(10°C) | 1.3 in(32 mm) | 66% | 6.4 |
| JunJuneBest | 78°F(25°C) | 52°F(11°C) | 0.3 in(8 mm) | 62% | 7.3 |
| JulJuly | 80°F(27°C) | 54°F(12°C) | 0.0 in(1 mm) | 62% | 7.2 |
| AugAugust | 81°F(27°C) | 55°F(13°C) | 0.1 in(2 mm) | 60% | 6.5 |
| SepSeptember | 81°F(27°C) | 53°F(12°C) | 0.2 in(4 mm) | 62% | 5.4 |
| OctOctoberBest | 76°F(25°C) | 51°F(10°C) | 1.8 in(46 mm) | 60% | 3.8 |
| NovNovember | 65°F(19°C) | 46°F(8°C) | 4.4 in(113 mm) | 73% | 2.5 |
| DecDecember | 58°F(14°C) | 42°F(6°C) | 9.4 in(238 mm) | 73% | 1.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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