The San Francisco historical weather page is built for travel planning and destination comparison, covering monthly temperature, rainfall, rainy days, and sunshine trends from 2015 through the latest complete month. Best time to visit San Francisco. Searches for the best time to visit San Francisco usually need monthly temperature, rainfall, and rainy-day context. Use the month-by-month view to find comfortable travel windows instead of relying only on annual averages. San Francisco average temperature by month. For queries such as San Francisco weather in April, San Francisco temperature in August, or San Francisco historical rainfall, start with the monthly pattern and then compare specific years when timing matters. How to read San Francisco weather patterns. San Francisco, California sits in a temperate climate band. Check the full monthly range because the warmer season (June to August) and cooler season (December to February) can feel very different for travel planning. San Francisco rainfall and seasonality. For outdoor plans in San Francisco, compare both total rainfall and rainy days by month. Shoulder periods (March-May and September-November) are useful for balancing temperature comfort, rainfall risk, and travel demand. When to compare San Francisco with other destinations. If you are choosing between several cities, compare San Francisco with nearby destinations in the same month. This avoids relying only on annual averages and makes temperature and precipitation differences clearer.
San Francisco Historical Weather Since 2015 | Latest Complete Month Data
San Francisco historical weather from 2015 through the latest complete month: monthly temperature, rainfall, sunshine, yearly comparisons, and travel timing references. The San Francisco historical weather page is built for travel planning and destination comparison, covering monthly temperature, rainfall, rainy days, and sunshine trends from 2015 through the latest complete month. Best time to visit San Francisco. Searches for the best time to visit San Francisco usually need monthly temperature, rainfall, and rainy-day context. Use the month-by-month view to find comfortable travel windows instead of relying only on annual averages. San Francisco average temperature by month. For queries such as San Francisco weather in April, San Francisco temperature in August, or San Francisco historical rainfall, start with the monthly pattern and then compare specific years when timing matters. How to read San Francisco weather patterns. San Francisco, California sits in a temperate climate band. Check the full monthly range because the warmer season (June to August) and cooler season (December to February) can feel very different for travel planning. San Francisco rainfall and seasonality. For outdoor plans in San Francisco, compare both total rainfall and rainy days by month. Shoulder periods (March-May and September-November) are useful for balancing temperature comfort, rainfall risk, and travel demand. When to compare San Francisco with other destinations. If you are choosing between several cities, compare San Francisco with nearby destinations in the same month. This avoids relying only on annual averages and makes temperature and precipitation differences clearer. San Francisco historical weather from 2015 through the latest complete month: monthly temperature, rainfall, sunshine, yearly comparisons, and travel timing references.
San Francisco monthly fact table
These facts are generated from historical monthly averages for 2015-01-01/2026-05-31, ready for best-month, rainy-season, hottest-month, and coldest-month answers.
- Recommended month: October
- Hottest month: September
- Coldest month: December
- Rainiest month: December
| Month | Avg Temp | Precip | Rainy Days | Sunshine |
|---|
| January | 10.6°C | 112 mm | 11.7 | 7.1 h |
| February | 11.2°C | 95 mm | 9.6 | 8.6 h |
| March | 12.2°C | 87 mm | 12.1 | 9.5 h |
| April | 12.9°C | 39 mm | 6.8 | 11.3 h |
| May | 13.9°C | 16 mm | 4.2 | 12.8 h |
| June | 15.4°C | 1 mm | 1.1 | 13.3 h |
| July | 15.7°C | 1 mm | 0.9 | 13 h |
| August | 16.6°C | 1 mm | 1.6 | 12.3 h |
| September | 17.2°C | 4 mm | 2.7 | 11.3 h |
| October | 16.3°C | 30 mm | 4.9 | 9.7 h |
| November | 12.8°C | 62 mm | 8.4 | 8.4 h |
| December | 10.4°C | 129 mm | 12.6 | 6.7 h |
Source: Open-Meteo Archive; generated: 2026-06-07.
San Francisco historical weather travel guide
When is the best time to visit San Francisco?
Based on historical monthly averages for 2015-01-01/2026-05-31, the recommended month for San Francisco is October, with an average temperature around 16.3°C, average precipitation around 30 mm, and a travel comfort score of 100.
Is it hot in San Francisco in summer?
The hottest month in San Francisco historical averages is September, with an average temperature around 17.2°C and an average high around 21.2°C. For summer trips, check rainfall and heat precautions together.
When is the rainy season in San Francisco?
Rain is most concentrated in San Francisco during January, February, December. The rainiest month is December, with average precipitation around 129 mm and about 12.6 rainy days.
What is the coldest month in San Francisco?
The coldest month in San Francisco historical averages is December, with an average temperature around 10.4°C and an average low around 7.9°C. Prepare warm clothing for winter travel.