Weather & Climate in Tomales, CA

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

Tomales enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 49°F in January while summers reach 65°F in July / relatively mild seasonal variation. The area gets 290 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 53.8 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 85 feet.

Temperature

49°F Jan (10°C) 65°F Jul (18°C)

Annual Average	57.6°F
	7% above US avg
January Average	49°F (10°C)
July Average	65°F (18°C)
Sunny Days	290 days/yr

Geography

Elevation	85 ft (26 m)
Area	0.3 sq mi (0.9 km²)
Population Density	582/sq mi
Coordinates	38.2470°N, 122.9054°W
Timezone	America/Los_Angeles
County	Marin County County
Nearest Airport	Metro Oakland International (OAK) 52 miles away

Precipitation & Snow

Annual Rainfall 53.8"

42% above US avg

Wettest Month (Jan) 8.03"

Driest Month (Jul) 0.08"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	96.4 / 100
Social Vulnerability	24.7 / 100
Community Resilience	99.2 / 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	Relatively Low
Cold Wave	No Rating
Landslide	Relatively High
Coastal Flood	Very High
Tsunami	Relatively Moderate
Volcano	Very Low

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

Earthquake History

4,068 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	52 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	121 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	45 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	51 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	137 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	64 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	143 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	150 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	68 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	42 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	58 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	67 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	64 km	2 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	105 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	31 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	64 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	69 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	62 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	62 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	64 km	1 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Jun 1, 1958	EF2	8 km	15.0 mi	0
Mar 18, 2011	EF1	29 km	0.1 mi	0
Mar 20, 2005	EF1	79 km	3.0 mi	0
Jan 27, 2005	EF1	46 km	0.5 mi	0
Dec 5, 1998	EF1	29 km	1.5 mi	0
Dec 23, 1996	EF1	2 km	6.0 mi	0
Feb 22, 1996	EF1	37 km	1.0 mi	0
Dec 2, 1992	EF1	35 km	3.0 mi	0
Dec 2, 1992	EF1	18 km	1.0 mi	0
Dec 2, 1992	EF1	17 km	7.5 mi	0
Feb 27, 1983	EF1	29 km	0.8 mi	0
Nov 10, 1964	EF1	33 km	1.0 mi	0
Feb 17, 1959	EF1	43 km	0.5 mi	0
Apr 1, 1958	EF1	85 km	0.2 mi	0
Apr 27, 2016	EF0	75 km	0.2 mi	0
Apr 7, 2011	EF0	69 km	0.1 mi	0
Jan 11, 2005	EF0	82 km	0.1 mi	0
Dec 29, 2004	EF0	29 km	0.2 mi	0
Dec 5, 1998	EF0	60 km	1.5 mi	0
May 12, 1998	EF0	78 km	0.2 mi	0

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

Tsunami History

4 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	93 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	99 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	70 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	146 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (81 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	81 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	69 km
2015	ROCKY	96,125	84 km
2018	COUNTY	92,450	81 km
2019	KINCADE	77,780	49 km
2015	VALLEY	77,507	65 km
2020	GLASS	68,020	46 km
2017	NUNS	56,883	37 km
2020	WALLBRIDGE	55,194	42 km
2017	ATLAS	51,664	60 km
2018	RIVER	48,920	90 km
2004	RUMSEY	39,335	79 km
1999	SIXTEEN	37,162	80 km
2017	TUBBS	36,981	41 km
1988	MILLER	35,750	74 km
2017	POCKET	18,691	58 km
2012	SIXTEEN COMPLEX	18,191	100 km
2008	WALKER	12,441	98 km
2004	GEYSERS	12,075	55 km
1995	VISION	11,931	23 km
1985	UNNAMED	9,655	68 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	49°F (10°C)	8.0 in	Wettest
February	51°F (11°C)	6.7 in
March	52°F (11°C)	5.6 in
April	55°F (13°C)	2.1 in
May	57°F (14°C)	0.8 in
June	61°F (16°C)	0.2 in
July	65°F (18°C)	0.1 in	Warmest, Driest
August	64°F (18°C)	0.2 in
September	64°F (18°C)	0.6 in
October	60°F (16°C)	2.3 in
November	53°F (12°C)	5.8 in
December	48°F (9°C)	6.3 in	Coldest

Tomales has a seasonal temperature swing of 17°F / from 48°F in December to 65°F in July. Total annual precipitation is 38.7 inches, with January being the wettest month (8.0") and July the driest (0.1").

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