- WinterDec–Feb47°59°
- December47°59°
- January47°58°
- February48°61°
- SpringMar–May50°64°
- March49°63°
- April50°64°
- May52°65°
- SummerJun–Aug55°68°
- June53°67°
- July55°67°
- August56°69°
- AutumnSep–Nov54°68°
- September56°71°
- October55°70°
- November51°64°
San Francisco, CA Weather by Month and Climate Averages
San Francisco, CA gets 22.9 in of precipitation a year over about 71 rainy days. September is the warmest month (average high 71°F) and January the coldest (average low 47°F).
San Francisco climate at a glance
Mediterranean climate
San Francisco, CA has mild summers and mild winters. Daytime highs range from about 58°F in January to 71°F in September. December is usually the wettest month. The most comfortable time to visit is typically March to November, when daytime highs sit near 67°F.
How much rain does San Francisco get?
San Francisco gets 22.9 in of precipitation in an average year, spread over about 71 days with measurable rain. That is fewer rainy days than 66% of the US.
December is the wettest month, with 4.8 in. July is the driest, with 0.0 in. December has the most rainy days, about 12.
The longest dry spell in the last five years lasted 67 days, to October 30, 2024.
See where San Francisco ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in California.
San Francisco weather by month
San Francisco weather in January
In January, San Francisco averages a high of 58°F and a low of 47°F. It gets 4.4 in of precipitation over about 11 rainy days. The sun is out about 36% of daylight hours. The January record high is 76°F (2021) and the record low is 36°F (1997).
San Francisco weather in February
In February, San Francisco averages a high of 61°F and a low of 48°F. It gets 4.4 in of precipitation over about 11 rainy days. The sun is out about 53% of daylight hours. The February record high is 81°F (1986) and the record low is 31°F (1989).
San Francisco weather in March
In March, San Francisco averages a high of 63°F and a low of 49°F. It gets 3.1 in of precipitation over about 11 rainy days. The sun is out about 48% of daylight hours. The March record high is 90°F (2026) and the record low is 39°F (2023). March is one of the most comfortable months to visit.
San Francisco weather in April
In April, San Francisco averages a high of 64°F and a low of 50°F. It gets 1.6 in of precipitation over about 7 rainy days. The sun is out about 57% of daylight hours. The April record high is 94°F (1989) and the record low is 40°F (1999). April is one of the most comfortable months to visit.
San Francisco weather in May
In May, San Francisco averages a high of 65°F and a low of 52°F. It gets 0.7 in of precipitation over about 4 rainy days. The sun is out about 58% of daylight hours. The May record high is 97°F (2008) and the record low is 43°F (2003). May is one of the most comfortable months to visit.
San Francisco weather in June
In June, San Francisco averages a high of 67°F and a low of 53°F. It gets 0.2 in of precipitation over about 2 rainy days. The sun is out about 56% of daylight hours. The June record high is 103°F (2000) and the record low is 47°F (1999). June is one of the most comfortable months to visit.
San Francisco weather in July
In July, San Francisco averages a high of 67°F and a low of 55°F. It gets 0.0 in of precipitation over about 1 rainy days. The sun is out about 48% of daylight hours. The July record high is 92°F (1984) and the record low is 48°F (1999). July is one of the most comfortable months to visit.
San Francisco weather in August
In August, San Francisco averages a high of 69°F and a low of 56°F. It gets 0.1 in of precipitation over about 1 rainy days. The sun is out about 49% of daylight hours. The August record high is 98°F (2010) and the record low is 50°F (1978). August is one of the most comfortable months to visit.
San Francisco weather in September
In September, San Francisco averages a high of 71°F and a low of 56°F. It gets 0.1 in of precipitation over about 1 rainy days. The sun is out about 55% of daylight hours. The September record high is 106°F (2017) and the record low is 49°F (1970). September is one of the most comfortable months to visit.
San Francisco weather in October
In October, San Francisco averages a high of 70°F and a low of 55°F. It gets 0.9 in of precipitation over about 4 rainy days. The sun is out about 59% of daylight hours. The October record high is 102°F (1987) and the record low is 46°F (1971). October is one of the most comfortable months to visit.
San Francisco weather in November
In November, San Francisco averages a high of 64°F and a low of 51°F. It gets 2.6 in of precipitation over about 8 rainy days. The sun is out about 53% of daylight hours. The November record high is 83°F (1986) and the record low is 40°F (1994). November is one of the most comfortable months to visit.
San Francisco weather in December
In December, San Francisco averages a high of 59°F and a low of 47°F. It gets 4.8 in of precipitation over about 12 rainy days. The sun is out about 34% of daylight hours. The December record high is 73°F (2021) and the record low is 28°F (1990).
Sunshine, humidity and wind in San Francisco
October is the sunniest month in San Francisco, with sunshine about 59% of daylight hours. December is the cloudiest, at 34%. Over the year the sun shines about 51% of daylight hours. San Francisco is sunnier than 63% of the US.
Humidity peaks in July at 82% and is lowest in October at 73%.
San Francisco has about 4 days a year above 90°F. San Francisco is cooler than 92% of the US.
See where San Francisco ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
San Francisco weather records
The hottest temperature on record at the San Francisco station is 106°F, on September 1, 2017. The coldest is 28°F, on December 22, 1990.
The wettest day on record brought 5.5 in of rain, on November 5, 1994.
34 all-time records have been set at the station since 1970.
The best time to visit San Francisco
The most comfortable time to visit is typically March to November, when daytime highs sit near 67°F.
Winter (December–February) is mild, with average highs around 59°F and lows near 47°F.
Spring (March–May) is mild, with average highs around 64°F and lows near 50°F.
Summer (June–August) is mild, with average highs around 68°F and lows near 55°F. It can feel humid.
Autumn (September–November) is warm, with average highs around 68°F and lows near 54°F.
Monthly climate
| Month | Precip | Rain days | Humidity | Sunshine | Sea temp | Record high | Record low |
|---|---|---|---|---|---|---|---|
| January | 4.4 in | 11 | 80% | 36% | 53° | 76° | 36° |
| February | 4.4 in | 11 | 75% | 53% | 53° | 81° | 31° |
| March | 3.1 in | 11 | 74% | 48% | 53° | 90° | 39° |
| April | 1.6 in | 7 | 75% | 57% | 53° | 94° | 40° |
| May | 0.70 in | 4 | 76% | 58% | 54° | 97° | 43° |
| June | 0.20 in | 2 | 78% | 56% | 56° | 103° | 47° |
| July | 0.01 in | 1 | 82% | 48% | 57° | 92° | 48° |
| August | 0.06 in | 1 | 82% | 49% | 59° | 98° | 50° |
| September | 0.10 in | 1 | 80% | 55% | 60° | 106° | 49° |
| October | 0.94 in | 4 | 73% | 59% | 58° | 102° | 46° |
| November | 2.6 in | 8 | 75% | 53% | 55° | 83° | 40° |
| December | 4.8 in | 12 | 82% | 34% | 53° | 73° | 28° |
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
San Francisco climate questions
How much rain does San Francisco get?
San Francisco gets 22.9 in of precipitation in an average year, over about 71 rainy days.
What is the wettest month in San Francisco?
December is the wettest month in San Francisco, with 4.8 in. July is the driest, with 0.0 in.
How many rainy days does San Francisco have a year?
San Francisco has about 71 days with measurable rain in an average year. December has the most, about 12.
What is the hottest month in San Francisco?
September is the warmest month in San Francisco, with an average high of 71°F.
What is the coldest month in San Francisco?
January is the coldest month in San Francisco, with an average low of 47°F.
What is the record high temperature in San Francisco?
The record high at the San Francisco station is 106°F, set on September 1, 2017. The record low is 28°F, on December 22, 1990.
What is the sunniest month in San Francisco?
October is the sunniest month in San Francisco, with sunshine about 59% of daylight hours. December is the cloudiest.
What is the best time to visit San Francisco?
The most comfortable time to visit is typically March to November, when daytime highs sit near 67°F.
Source: NOAA GHCN-Daily station SAN FRANCISCO DWTN (1 km away).
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Normals from NOAA GHCN-Daily station SAN FRANCISCO DWTN.