San Mateo, California Climate by Month
San Mateo, California, United States
Warm summers and mild winters, with most rain from December to March.
The climate in San Mateo is one of warm summers and mild winters, with most rain from December to March. Expect highs of 76°F (24°C) in September and 59°F (15°C) in January, with the coldest nights (December) near 42°F (6°C). Of the 20 in (511 mm) of rain in a typical year, 72% falls from December to March. June to September are almost completely dry.
- Warmest month
- 76°F(24°C)
- Average high, September
- Coldest nights
- 42°F(6°C)
- Average low, December
- Rain per year
- 20 in(511 mm)
- Wettest: January
- Humidity
- 71%
- Sunniest: June
Best and worst months in San Mateo
Best for weatherJuly to September are the best time for weather in San Mateo: highs near 75°F (24°C) and almost no rain.
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 September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Mateo weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 59°F(15°C) | 43°F(6°C) | 4.1 in(105 mm) | 80% | 1.9 |
| FebFebruary | 62°F(17°C) | 45°F(7°C) | 3.9 in(98 mm) | 72% | 2.7 |
| MarMarch | 64°F(18°C) | 46°F(8°C) | 2.8 in(72 mm) | 74% | 4.2 |
| AprApril | 67°F(20°C) | 47°F(9°C) | 1.5 in(37 mm) | 69% | 5.5 |
| MayMay | 69°F(21°C) | 50°F(10°C) | 0.6 in(14 mm) | 68% | 6.3 |
| JunJune | 73°F(23°C) | 53°F(12°C) | 0.2 in(4 mm) | 66% | 7.3 |
| JulJulyBest | 74°F(23°C) | 55°F(13°C) | 0.0 in(1 mm) | 68% | 7.1 |
| AugAugustBest | 75°F(24°C) | 56°F(13°C) | 0.0 in(1 mm) | 71% | 6.5 |
| SepSeptemberBest | 76°F(24°C) | 55°F(13°C) | 0.1 in(2 mm) | 66% | 5.4 |
| OctOctober | 73°F(23°C) | 51°F(10°C) | 1.1 in(27 mm) | 64% | 3.8 |
| NovNovember | 65°F(19°C) | 46°F(8°C) | 2.2 in(56 mm) | 73% | 2.6 |
| DecDecember | 59°F(15°C) | 42°F(6°C) | 3.7 in(94 mm) | 79% | 1.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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