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San Diego Weather by Month
Average temperatures, rainfall and humidity for San Diego, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical San Diego month looks like before you travel — then check the live San Diego forecast for the days ahead.
Warmest month
August
28°C average high
Coolest month
January
9°C average low
Wettest month
March
60 mm of rain
Driest month
July
8 mm of rain
Average temperature and rainfall in San Diego by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 19°C | 9°C | -7°C / 30°C | 48 mm | 65% | 9 km/h |
| February | 20°C | 9°C | -2°C / 32°C | 42 mm | 66% | 10 km/h |
| March | 20°C | 11°C | 0°C / 33°C | 60 mm | 70% | 11 km/h |
| April | 21°C | 12°C | 2°C / 35°C | 26 mm | 69% | 11 km/h |
| May | 21°C | 14°C | 3°C / 36°C | 29 mm | 73% | 11 km/h |
| June | 24°C | 16°C | 6°C / 40°C | 15 mm | 75% | 10 km/h |
| July | 27°C | 18°C | 10°C / 36°C | 8 mm | 75% | 10 km/h |
| August | 28°C | 19°C | 10°C / 35°C | 12 mm | 75% | 10 km/h |
| September | 27°C | 18°C | 9°C / 39°C | 11 mm | 73% | 10 km/h |
| October | 26°C | 14°C | 4°C / 38°C | 15 mm | 69% | 9 km/h |
| November | 22°C | 11°C | 1°C / 35°C | 24 mm | 63% | 9 km/h |
| December | 19°C | 9°C | -5°C / 28°C | 50 mm | 67% | 9 km/h |
Best time to visit San Diego
The most comfortable time to visit San Diego is generally June and October to November, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around March, totalling about 339 mm a year.
Travellers who prefer heat should aim for August, when highs average 28°C. March is the month to avoid if rain would spoil your plans — it averages 60 mm, roughly 7× the rainfall of the driest month (July).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the San Diego forecast for what is happening now.