Weather & Climate in San Francisco, CA

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

San Francisco enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 53°F in January while summers reach 67°F in July / relatively mild seasonal variation. The area gets 322 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 29.7 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 33. 76% of days have good air quality.

Temperature

53°F Jan (12°C) 67°F Jul (20°C)

Annual Average	58.5°F
	8% above US avg
January Average	53°F (12°C)
July Average	67°F (20°C)
Sunny Days	322 days/yr

Geography

Area	231.9 sq mi (600.6 km²)
Population Density	17,912/sq mi
Coordinates	37.7272°N, 123.0322°W
Timezone	America/Los_Angeles
County	San Francisco County County
Nearest Airport	San Francisco International (SFO) 37 miles away

Precipitation & Snow

Annual Rainfall 29.7"

22% below US avg

Snowfall 0.0"

Wettest Month (Jan) 8.80"

Driest Month (Jul) 0.10"

Air Quality

AQI Median	33.0
Rating	Good
Good Days %	76.1%
Unhealthy Days	0

Natural Hazard Risk

Overall Risk	Very High
Risk Score	99.5 / 100
Social Vulnerability	48.1 / 100
Community Resilience	99.7 / 100

Hazard Breakdown

Tornado	Relatively Low
Earthquake	Very High
Wildfire	Very Low
Flood	Relatively High
Hail	Very Low
Strong Wind	Very Low
Heat Wave	Relatively Moderate
Winter Weather	Very Low
Lightning	Relatively Low
Drought	Relatively Moderate
Cold Wave	No Rating
Landslide	Relatively High
Coastal Flood	Relatively Moderate
Tsunami	Relatively Moderate
Volcano	Very Low

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

3,991 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.

Aug 24, 2014	The 2014 South Napa, California Earthquake	M6.0	83 km	11 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	147 km	7 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	91 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	109 km	7 km
May 12, 2006	7 km W of Cobb, California	M4.7	123 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	123 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	128 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	127 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	36 km	8 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	143 km	15 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	116 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	126 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	122 km	2 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	81 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	122 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	128 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	121 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	121 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	123 km	1 km
Mar 1, 2011	8 km W of Cobb, California	M4.4	122 km	2 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

26 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 2 injuries.

Date	Rating	Distance	Path	Fatalities
May 5, 1998	EF2	97 km	0.6 mi	0
Jun 1, 1958	EF2	62 km	15.0 mi	0
Jan 11, 1951	EF2	90 km	5.7 mi	0
Mar 18, 2011	EF1	86 km	0.1 mi	0
Mar 20, 2005	EF1	55 km	3.0 mi	0
Jan 27, 2005	EF1	100 km	0.5 mi	0
Dec 5, 1998	EF1	86 km	1.5 mi	0
May 5, 1998	EF1	89 km	0.3 mi	0
Dec 23, 1996	EF1	59 km	6.0 mi	0
Feb 22, 1996	EF1	95 km	1.0 mi	0
Dec 2, 1992	EF1	93 km	3.0 mi	0
Dec 2, 1992	EF1	76 km	7.5 mi	0
Dec 2, 1992	EF1	77 km	1.0 mi	0
Feb 27, 1983	EF1	86 km	0.8 mi	0
Nov 10, 1964	EF1	92 km	1.0 mi	0
Feb 17, 1959	EF1	90 km	0.5 mi	0
Apr 1, 1958	EF1	61 km	0.2 mi	0
Apr 7, 2011	EF0	98 km	0.1 mi	0
Dec 29, 2004	EF0	86 km	0.2 mi	0
Dec 5, 1998	EF0	64 km	1.5 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

5 tsunamis recorded within 500 km. Highest wave on record: 4.5 m (15 ft).

Year	Location	Cause	Max Wave	Deaths	Distance
1868	N. CALIFORNIA	Eruption + Earthquake	4.5 m	30	82 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	127 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	69 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	47 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	116 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (140 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	140 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

12 wildfires (100+ acres) recorded within 100 km. Largest: CZU AUG LIGHTNING (85,894 acres, 2020).

Year	Name	Acres Burned	Distance
2020	CZU AUG LIGHTNING	85,894	97 km
2017	NUNS	56,883	83 km
2020	WALLBRIDGE	55,194	99 km
2017	ATLAS	51,664	99 km
2017	TUBBS	36,981	98 km
1995	VISION	11,931	38 km
2020	WOODWARD	4,952	38 km
2008	WILD	4,100	99 km
2020	MEYERS	2,460	88 km
1996	PGE 8	2,323	86 km
1991	TUNNEL	1,838	72 km
2017	THIRTY SEVEN	1,773	68 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	53°F (12°C)	8.8 in	Wettest
February	51°F (11°C)	7.3 in
March	52°F (11°C)	6.2 in
April	54°F (12°C)	2.5 in
May	57°F (14°C)	0.9 in
June	61°F (16°C)	0.3 in
July	67°F (20°C)	0.1 in	Warmest, Driest
August	64°F (18°C)	0.2 in
September	64°F (18°C)	0.5 in
October	61°F (16°C)	2.4 in
November	54°F (12°C)	6.2 in
December	49°F (9°C)	7.4 in	Coldest

San Francisco has a seasonal temperature swing of 18°F / from 49°F in December to 67°F in July. Total annual precipitation is 42.8 inches, with January being the wettest month (8.8") and July the driest (0.1").

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