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Get the San Diego CA weather forecast without ads, cookies, or tracking. Open-Meteo data, 10-day forecast, hourly conditions, and radar — all free. click here to hide this
August is the hottest month in San Diego CA, with an average high of 77°F / 25°C; December is the coldest (65°F / 19°C). February is the wettest month, averaging 2.2 in / 56 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 66 / 19 | 50 / 10 | 2.0 / 50 | 5 |
| Feb | 66 / 19 | 51 / 11 | 2.2 / 56 | 6 |
| Mar | 67 / 19 | 54 / 12 | 1.5 / 37 | 5 |
| Apr | 68 / 20 | 57 / 14 | 0.7 / 17 | 3 |
| May | 69 / 21 | 60 / 16 | 0.3 / 7 | 1 |
| Jun | 71 / 22 | 62 / 17 | 0.0 / 1 | 0 |
| Jul | 75 / 24 | 66 / 19 | 0.1 / 2 | 0 |
| Aug | 77 / 25 | 67 / 20 | 0.0 / 0 | 0 |
| Sep | 77 / 25 | 66 / 19 | 0.1 / 3 | 1 |
| Oct | 74 / 23 | 61 / 16 | 0.5 / 13 | 2 |
| Nov | 70 / 21 | 55 / 13 | 0.8 / 20 | 3 |
| Dec | 65 / 19 | 49 / 10 | 1.7 / 42 | 4 |
Extremes since 1939: highest 111°F / 44°C (September 26, 1963), lowest 16°F / -9°C (May 16, 2025).
Daylight lasts about 14.2 hours in June and 9.8 hours in December.
Data: Meteostat — San Diego International Airport, 1991–2020 averages.
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