Climate in San Diego — Annual Weather Overview
San Diego has a semi arid climate — warm and dry with low but seasonal rainfall. The hottest month is September (average high 25.6°C) and the coolest is March (17.2°C). There is a noticeable seasonal temperature shift of 8.4°C between September and March. Annual rainfall is modest at around 330mm, with March the wettest month (81.3mm) and June the driest (3.5mm). Average daily sunshine is 10.2 hours.
**Spring (March, April, May):** average highs 18.9°C, 117mm rain. **Summer (June, July, August):** average highs 23.9°C, 21mm rain. **Autumn (September, October, November):** average highs 23.5°C, 53mm rain. **Winter (December, January, February):** average highs 17.8°C, 140mm rain.
San Diego — Monthly Temperatures
San Diego — Monthly Rainfall
✅ Best months to visit
All year
ℹ️ No months to avoid
Weather in San Diego stays reasonable all year.
San Diego weather by month
| Month | High | Low | Rain | Sun/day | Rainy days | Rating |
|---|---|---|---|---|---|---|
| January | 17.3°C | 8.3°C | 64.6mm | 8.7h | 6 | 10/10 |
| February | 18.1°C | 8.0°C | 30.5mm | 9.4h | 4 | 10/10 |
| March | 17.2°C | 9.7°C | 81.3mm | 9.8h | 10 | 10/10 |
| April | 19.2°C | 12.2°C | 30.3mm | 10.5h | 3 | 10/10 |
| May | 20.3°C | 14.3°C | 5.3mm | 10.9h | 2 | 10/10 |
| June | 22.1°C | 16.0°C | 3.5mm | 11.7h | 1 | 10/10 |
| July | 24.1°C | 18.1°C | 6.1mm | 12.2h | 0 | 10/10 |
| August | 25.5°C | 19.1°C | 11.2mm | 11.5h | 1 | 10/10 |
| September | 25.6°C | 18.3°C | 17.5mm | 10.5h | 1 | 10/10 |
| October | 23.9°C | 15.2°C | 8.8mm | 9.6h | 3 | 10/10 |
| November | 21.1°C | 10.8°C | 26.8mm | 9.4h | 3 | 10/10 |
| December | 17.9°C | 8.9°C | 44.4mm | 8.0h | 6 | 10/10 |
For the full verdict on when to go, see the best time to visit San Diego. Seasonal breakdowns: spring, summer, autumn and winter.
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Frequently Asked Questions
What type of climate does San Diego have?
San Diego has a semi arid climate — warm and dry with low but seasonal rainfall. Average highs range from 17.2°C in March to 25.6°C in September.
What is the hottest month in San Diego?
September is the hottest month in San Diego, with average highs of 25.6°C and lows of 18.3°C.
What is the coldest month in San Diego?
March is the coolest month, with average highs of 17.2°C and lows of 8.0°C.
What is the wettest month in San Diego?
March is the wettest month, averaging 81.3mm of rainfall over around 10 rainy days.
How much rain does San Diego get per year?
San Diego receives around 330mm of rain per year. The driest month is June (3.5mm).
When is the best time to visit San Diego?
The best time to visit San Diego is All year. See the full month-by-month guide →
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.