San Francisco, CA Weather by Month and Climate Averages
Monthly normals · Rain · Snow Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in San Francisco, CA?
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).
Station: SAN FRANCISCO DWTN, 1 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
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.
Season
Months
Avg low
Avg high
Winter
Dec–Feb
47°
59°
Spring
Mar–May
50°
64°
Summer
Jun–Aug
55°
68°
Autumn
Sep–Nov
54°
68°
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.
From September 2025 to August 2026 San Francisco got 21.6 in of rain, against a normal of 22.9 in for those months. December 2025 had the most, with 5.4 in.
Monthly rainfall, September 2025 to August 2026, in inches. The dash on each month marks its 1991–2020 normal.
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. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 53% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 48% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 57% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 58% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 56% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 48% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 49% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 55% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 59% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 53% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 34% of daylight hours, derived from ERA5 cloud cover. 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 estimated sunshine of 59% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 34%. The annual cloud-cover estimate is 51% of daylight hours; it is not a measurement of sunshine duration. 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.
These records cover SAN FRANCISCO DWTN during 1970–2026. Earlier records or other stations in the city may differ.
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 in the available station history brought 5.5 in of precipitation, 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.
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?
Within the available 1970–2026 station history, 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 estimated sunshine of 59% of daylight hours from ERA5 cloud cover. 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.
