Weather & Climate in Sonoma, CA

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

Sonoma enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 48°F in January while summers reach 70°F in July. The area gets 326 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 28.4 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 19 / among the cleanest air in the country. 95% of days have good air quality. The city sits at an elevation of 78 feet.

Temperature

48°F Jan (9°C) 70°F Jul (21°C)

Annual Average	59.0°F
	9% above US avg
January Average	48°F (9°C)
July Average	70°F (21°C)
Sunny Days	326 days/yr

Geography

Elevation	78 ft (24 m)
Area	2.7 sq mi (7.1 km²)
Population Density	3,915/sq mi
Coordinates	38.2903°N, 122.4598°W
Timezone	America/Los_Angeles
County	Napa County County
Nearest Airport	Metro Oakland International (OAK) 41 miles away

Precipitation & Snow

Annual Rainfall 28.4"

25% below US avg

Snowfall 0.0"

Wettest Month (Jan) 6.38"

Driest Month (Jul) 0.04"

Air Quality

AQI Median	19.0
Rating	Good
Good Days %	95.1%
Unhealthy Days	0

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	95.3 / 100
Social Vulnerability	38.5 / 100
Community Resilience	76.0 / 100

Hazard Breakdown

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

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

Earthquake History

4,279 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	15 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	119 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	11 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	50 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	142 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	66 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	122 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	129 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	67 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	47 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	66 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	66 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	66 km	2 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	139 km	4 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	115 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	14 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	66 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	70 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	63 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	62 km	4 km

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

Tornado History

48 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 injury.

Date	Rating	Distance	Path	Fatalities
Feb 7, 1978	EF2	99 km	1.9 mi	0
Jun 1, 1958	EF2	45 km	15.0 mi	0
Mar 18, 2011	EF1	28 km	0.1 mi	0
Jan 23, 2010	EF1	74 km	1.6 mi	0
Mar 20, 2005	EF1	71 km	3.0 mi	0
Jan 27, 2005	EF1	68 km	0.5 mi	0
Dec 5, 1998	EF1	28 km	1.5 mi	0
Dec 23, 1996	EF1	41 km	6.0 mi	0
Feb 22, 1996	EF1	37 km	1.0 mi	0
Dec 2, 1992	EF1	40 km	7.5 mi	0
Dec 2, 1992	EF1	35 km	1.0 mi	0
Dec 2, 1992	EF1	43 km	3.0 mi	0
Feb 27, 1983	EF1	28 km	0.8 mi	0
Nov 10, 1964	EF1	40 km	1.0 mi	0
Feb 17, 1959	EF1	73 km	0.5 mi	0
Apr 1, 1958	EF1	75 km	0.2 mi	0
Nov 8, 2022	EF0	100 km	0.8 mi	0
Sep 28, 2019	EF0	70 km	1.7 mi	0
Jan 11, 2017	EF0	93 km	0.4 mi	0
Apr 27, 2016	EF0	39 km	0.2 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	73 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	148 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	89 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	66 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	131 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (80 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	80 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: HENNESSEY (314,241 acres, 2020).

Year	Name	Acres Burned	Distance
2020	HENNESSEY	314,241	40 km
2015	ROCKY	96,125	69 km
2018	COUNTY	92,450	51 km
2019	KINCADE	77,780	51 km
2015	VALLEY	77,507	57 km
2020	GLASS	68,020	30 km
2017	NUNS	56,883	8 km
2020	WALLBRIDGE	55,194	60 km
2017	ATLAS	51,664	21 km
2018	RIVER	48,920	98 km
2004	RUMSEY	39,335	54 km
1999	SIXTEEN	37,162	58 km
2017	TUBBS	36,981	36 km
1988	MILLER	35,750	36 km
2017	POCKET	18,691	65 km
2012	SIXTEEN COMPLEX	18,191	81 km
2006	ZAM ASSIST	14,404	71 km
2008	WALKER	12,441	86 km
2004	GEYSERS	12,075	55 km
1995	VISION	11,931	45 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	6.4 in	Wettest
February	51°F (11°C)	5.6 in
March	54°F (12°C)	4.3 in
April	57°F (14°C)	1.6 in
May	62°F (17°C)	0.7 in
June	67°F (19°C)	0.2 in
July	70°F (21°C)	0.0 in	Driest
August	70°F (21°C)	0.1 in	Warmest
September	68°F (20°C)	0.4 in
October	63°F (17°C)	1.7 in
November	54°F (12°C)	4.3 in
December	47°F (8°C)	4.8 in	Coldest

Sonoma has a seasonal temperature swing of 23°F / from 47°F in December to 70°F in August. Total annual precipitation is 30.0 inches, with January being the wettest month (6.4") and July the driest (0.0").

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