Weather in San Francisco Today
Current temperature in San Francisco: 15°C (59°F). Mainly Clear. Today's high 19°C (66°F), low 14°C (57°F).
Today's Daylight Forecast
Moon & Islamic Calendar
High UV apply sunscreen before heading out. A hat or sun umbrella is recommended during peak hours.
5-Day Weather Forecast
Full 15-Day ForecastAtmospheric Details
Today vs Normal
The long-term average high for today is 24°C.
4 of the last 19 days with published data ran above normal.
It continues that pattern - today's forecast is also running below normal.
Red = above normal, blue = at or below · last 12 days
Air Quality
Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.
Health & Activity Advice
UV index is 7 today — high. Apply sunscreen before heading out, and consider a hat or shade during peak hours (roughly late morning to mid-afternoon).
Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.
Morning before 10 AM or evening after 4 PM is the more comfortable window for outdoor activity today.
Nearby Regional Outlook
San Francisco Weather Radar
Live precipitation · Cloud cover · Wind
Frequently Asked Questions
What is the hottest month in San Francisco?
The hottest month in San Francisco is typically September, with daytime highs averaging around 20.9°C (70°F), based on 10 years of historical weather data. Overnight lows during this period average near 14.4°C (58°F).
What is the coldest month in San Francisco?
The coldest month in San Francisco is typically January, with overnight lows averaging around 7.9°C (46°F) and daytime highs near 13.7°C (57°F), based on 10 years of historical weather data.
When does the rainy season start in San Francisco?
San Francisco has a clearly defined rainy season running roughly from January, March, December, based on 10 years of historical rainfall data. December is typically the wettest month, averaging about 133 mm of rain. Outside this window, rainfall is much lighter for the rest of the year.
What's the best time of year to visit San Francisco?
The best time to visit San Francisco is typically July to September, when daytime highs average a comfortable 19.8°C (68°F). Rainfall during this window averages around 2 mm, well below the 133 mm seen in December, the wettest month. This is based on 10 years of historical weather data.
Is San Francisco's air quality safe right now?
As of the latest reading, San Francisco's air quality index (AQI) is 22, rated "Good", based on the nearest monitoring station. Air quality is considered satisfactory, with little to no health risk.