San Carlos, California Climate by Month
San Carlos, California, United States
Warm summers and mild winters, with most rain from December to March.
San Carlos has warm summers and mild winters, with most rain from December to March. September is the warmest month, with highs around 77°F (25°C); January is the coolest at 59°F (15°C), and nights dip to 42°F (5°C). It gets 20 in (498 mm) of rain a year, 72% of it from December to March. June to September are almost completely dry.
- Warmest month
- 77°F(25°C)
- Average high, September
- Coldest nights
- 42°F(5°C)
- Average low, December
- Rain per year
- 20 in(498 mm)
- Wettest: January
- Humidity
- 70%
- Sunniest: June
Best and worst months in San Carlos
Best for weatherThe most comfortable weather comes from June to August, with highs around 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 July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Carlos weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 59°F(15°C) | 42°F(6°C) | 4.0 in(102 mm) | 80% | 1.9 |
| FebFebruary | 62°F(17°C) | 44°F(7°C) | 3.7 in(93 mm) | 73% | 2.7 |
| MarMarch | 65°F(18°C) | 46°F(8°C) | 2.8 in(70 mm) | 74% | 4.2 |
| AprApril | 68°F(20°C) | 47°F(8°C) | 1.5 in(37 mm) | 69% | 5.5 |
| MayMay | 71°F(21°C) | 50°F(10°C) | 0.5 in(13 mm) | 67% | 6.3 |
| JunJuneBest | 74°F(23°C) | 54°F(12°C) | 0.2 in(4 mm) | 64% | 7.3 |
| JulJulyBest | 75°F(24°C) | 55°F(13°C) | 0.0 in(1 mm) | 66% | 7.1 |
| AugAugustBest | 76°F(25°C) | 56°F(13°C) | 0.0 in(1 mm) | 68% | 6.5 |
| SepSeptember | 77°F(25°C) | 54°F(12°C) | 0.1 in(2 mm) | 65% | 5.4 |
| OctOctober | 73°F(23°C) | 50°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(5°C) | 3.6 in(92 mm) | 80% | 1.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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