Climate in San Francisco — Annual Weather Overview
San Francisco has a oceanic climate — mild temperatures year-round with regular rainfall. The hottest month is September (average high 20.3°C) and the coolest is December (13.2°C). Temperatures are consistent year-round, with highs ranging only 7.1°C between the warmest and coolest months. Annual rainfall totals around 531mm. December is the wettest month at 182.2mm, while July averages just 0.1mm. Average daily sunshine is 10.4 hours.
**Spring (March, April, May):** average highs 15.2°C, 125mm rain. **Summer (June, July, August):** average highs 18.6°C, 3mm rain. **Autumn (September, October, November):** average highs 18.8°C, 89mm rain. **Winter (December, January, February):** average highs 13.7°C, 314mm rain.
San Francisco — Monthly Temperatures
San Francisco — Monthly Rainfall
✅ Best months to visit
All year
ℹ️ No months to avoid
Weather in San Francisco stays reasonable all year.
San Francisco weather by month
| Month | High | Low | Rain | Sun/day | Rainy days | Rating |
|---|---|---|---|---|---|---|
| January | 13.3°C | 7.7°C | 98.0mm | 7.3h | 9 | 10/10 |
| February | 14.5°C | 7.5°C | 33.4mm | 9.4h | 4 | 10/10 |
| March | 13.6°C | 8.4°C | 88.2mm | 9.5h | 10 | 10/10 |
| April | 15.0°C | 9.7°C | 21.8mm | 11.7h | 3 | 10/10 |
| May | 16.9°C | 11.4°C | 15.4mm | 12.8h | 4 | 10/10 |
| June | 18.1°C | 12.9°C | 2.5mm | 13.0h | 0 | 10/10 |
| July | 18.0°C | 13.1°C | 0.1mm | 12.7h | 0 | 10/10 |
| August | 19.8°C | 14.5°C | 0.2mm | 12.2h | 0 | 10/10 |
| September | 20.3°C | 14.6°C | 4.0mm | 11.4h | 1 | 10/10 |
| October | 19.9°C | 13.0°C | 42.4mm | 9.5h | 2 | 10/10 |
| November | 16.2°C | 9.7°C | 42.5mm | 8.7h | 6 | 10/10 |
| December | 13.2°C | 8.0°C | 182.2mm | 6.4h | 12 | 9/10 |
For the full verdict on when to go, see the best time to visit San Francisco. Seasonal breakdowns: spring, summer, autumn and winter.
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Frequently Asked Questions
What type of climate does San Francisco have?
San Francisco has a oceanic climate — mild temperatures year-round with regular rainfall. Average highs range from 13.2°C in December to 20.3°C in September.
What is the hottest month in San Francisco?
September is the hottest month in San Francisco, with average highs of 20.3°C and lows of 14.6°C.
What is the coldest month in San Francisco?
December is the coolest month, with average highs of 13.2°C and lows of 7.5°C.
What is the wettest month in San Francisco?
December is the wettest month, averaging 182.2mm of rainfall over around 12 rainy days.
How much rain does San Francisco get per year?
San Francisco receives around 531mm of rain per year. The driest month is July (0.1mm).
When is the best time to visit San Francisco?
The best time to visit San Francisco is All year. See the full month-by-month guide →
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Trip essentials for San Francisco
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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.