San Francisco weather
World cities · United States · 37.77°N 122.42°W
San Francisco, in United States, has its warmest weather in October, when daytime temperatures average 20.5°C, while February nights are the coldest at around 7.7°C. The city sees roughly 585mm of rain a year; December is normally the wettest month and July the driest. Figures are averaged from 2020–2024 observations.
Climate averages
| Month | Avg high | Avg low | Rain | Rain days |
|---|---|---|---|---|
| Jan | 13.5° | 7.9° | 109mm | 10 |
| Feb | 14.5° | 7.7° | 61mm | 6 |
| Mar | 13.9° | 8.6° | 96mm | 10 |
| Apr | 15.3° | 9.6° | 23mm | 3 |
| May | 17.3° | 11.2° | 17mm | 3 |
| Jun | 18.5° | 12.7° | 2mm | 0 |
| Jul | 18.5° | 13.2° | 0mm | 0 |
| Aug | 20° | 14.3° | 1mm | 0 |
| Sep | 20.4° | 14.4° | 4mm | 1 |
| Oct | 20.5° | 13° | 35mm | 3 |
| Nov | 16.2° | 9.7° | 63mm | 6 |
| Dec | 13.5° | 8.1° | 174mm | 12 |
Seasons in San Francisco
Spring (March–May). Daytime highs in San Francisco climb from 13.9°C in March to 17.3°C by May, while nights ease from 8.6°C to 11.2°C. The season brings around 136mm of rain in total.
Summer (June–August). The warmest stretch of the year: afternoons average 19.0°C, peaking in August at 20°C. July is usually the driest of the summer months (0mm over ~0 rainy days). Around the June solstice, San Francisco gets roughly 14.6 hours of daylight.
Autumn (September–November). Daytime temperatures fall from 20.4°C in September to 16.2°C by November, with around 102mm of rain across the season.
Winter (December–February). Nights average 7.9°C, with February the coldest month (average low 7.7°C, daytime high 14.5°C). Expect about 28 days with measurable rain over the three months, and only around 9.4 hours of daylight in mid-December.
How San Francisco compares
| San Francisco | UK town average | |
|---|---|---|
| Annual rainfall | 585mm | 1054mm |
| Rainy days per year | 54 | 167 |
| Summer daytime high | 19.0°C | 19.7°C |
| Winter night low | 7.9°C | 3.4°C |
San Francisco is about 44% drier than the average for the 121 UK towns tracked on this site (1054mm), based on 2020–2024 monthly normals.
San Francisco weather FAQs
What is the warmest month in San Francisco?
October is typically the warmest month in San Francisco, with average daytime highs of 20.5°C. Summer afternoons (June–August) average around 19.0°C.
What is the wettest month in San Francisco?
December is usually the wettest month, with around 174mm of rain over roughly 12 rainy days. July is typically the driest (0mm).
How much does it rain in San Francisco per year?
San Francisco receives roughly 585mm of precipitation per year, spread over about 54 days with at least 1mm of rain (based on 2020–2024 observations).
How cold are winters in San Francisco?
Winter nights (December–February) in San Francisco average around 7.9°C, with February typically the coldest month (average low 7.7°C).
When is the best time to visit San Francisco for good weather?
Late spring and summer offer the most reliable weather in San Francisco. July is typically the driest of the warm months (0mm of rain), while August is the warmest, averaging 20°C by day — and near the June solstice there are around 15 hours of daylight to enjoy.
How does San Francisco's weather compare with the UK?
San Francisco receives 585mm of rain a year, about 44% drier than the average for the 121 UK towns tracked on this site (1054mm). Summer daytime highs average 19.0°C against a UK-town average of 19.7°C, and winter nights average 7.9°C versus 3.4°C.