Climate Overview
The climate in San Francisco is hot. The average annual temperature is 27°C and approximately 2688mm of precipitation falls per year. San Francisco receives a notable amount of rainfall throughout the year, including during its driest month. San Francisco is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: June, August, July. The coldest months are February, January, March, when temperatures can drop to 25°C.
Temperature
San Francisco has relatively stable temperatures year-round, staying within a 3°C range. The warmest month is June, when average highs reach 28°C and the mean temperature sits around 28°C. February is the coolest month, with minimum temperatures around 25°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows.
Precipitation
San Francisco is a very wet location, receiving approximately 2688mm of precipitation annually, which averages out to around 224mm per month. The wettest month is December, averaging 380mm of rainfall. January and November also tend to see above-average precipitation. The driest month is May, with just 119mm. That's 260mm less than December, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.
Wind
San Francisco is moderately windy, with an average annual wind speed of 25km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 30km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in June, with average winds dropping to 19km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 11km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 29km/h in winter, 25km/h in spring, 21km/h in summer, 23km/h in autumn.
Seasons
84 days until Summer
It is currently spring in San Francisco, which began on March 20, 2026. San Francisco is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in June at around 28°C, while the coldest stretch bottoms out in February near 25°C. Summer is next, beginning on June 21, 2026 — 84 days from now.
Spring
Temperatures range from 26 to 28°C. Rainfall is heavy, totalling around 389mm across the season with a monthly average of 130mm. Winds are strong, averaging 25km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 27 to 28°C. Rainfall is heavy, totalling around 639mm across the season with a monthly average of 213mm. Winds are moderate at around 21km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 26 to 28°C. Rainfall is heavy, totalling around 750mm across the season with a monthly average of 250mm. Winds are moderate at around 23km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 25 to 27°C. Rainfall is heavy, totalling around 910mm across the season with a monthly average of 303mm. Winds are strong, averaging 29km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for San Francisco based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
