The warmest month in San Francisco is September, with an average high of 20.9°C and an average low of 14.4°C. The coldest month is December, with an average high of 13.5°C and an average low of 8°C. Between 2016 and 2025, the highest temperature recorded was 38.5°C (September 2, 2017) and the lowest was 0.4°C (December 19, 2016).
| Month | Avg. high | Avg. low | Precipitation |
|---|---|---|---|
| January | 13.7°C | 7.9°C | 126 mm |
| February | 14.6°C | 7.9°C | 96 mm |
| March | 14.6°C | 9°C | 103 mm |
| April | 15.9°C | 10.1°C | 32 mm |
| May | 17.2°C | 11.3°C | 17 mm |
| June | 18.9°C | 12.7°C | 1 mm |
| July | 18.7°C | 13.3°C | 0 mm |
| August | 19.7°C | 14.2°C | 1 mm |
| September | 20.9°C | 14.4°C | 4 mm |
| October | 20.4°C | 12.9°C | 32 mm |
| November | 16.5°C | 10.1°C | 64 mm |
| December | 13.5°C | 8°C | 133 mm |
Based on daily historical weather data 2016–2025. Weather data by Open-Meteo.com.
Explore detailed temperature patterns in San Francisco, United States through interactive candlestick charts. View historical weather data with daily temperature ranges, trends, and variations. Whether you're planning a trip to San Francisco or analyzing local climate patterns, our unique visualization makes temperature data easy to understand. Get insights into San Francisco's weather patterns from hourly updates to yearly historical data.