Weather & Climate in Tomales, CA

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

Tomales experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 50°F in January while summers reach 57°F in July / relatively mild seasonal variation. Annual precipitation totals 28.9 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 28 / among the cleanest air in the country. 86% of days have good air quality. The city sits at an elevation of 85 feet.

Temperature

50°F Jan (10°C) 57°F Jul (14°C)
Annual Average53.5°F
1% below US avg
January Average50°F (10°C)
July Average57°F (14°C)

Geography

Elevation85 ft (26 m)
Area0.3 sq mi (0.9 km²)
Population Density582/sq mi
Coordinates38.2470°N, 122.9054°W
TimezoneAmerica/Los_Angeles
CountyMarin County County
Nearest AirportMetro Oakland International (OAK)
52 miles away

Precipitation & Snow

Annual Rainfall 28.9"
24% below US avg
Snowfall 0.0"
Wettest Month (Feb) 6.04"
Driest Month (Aug) 0.11"

Air Quality

AQI Median28.0
RatingGood
Good Days %86.3%
Unhealthy Days0

Natural Hazard Risk

Overall RiskRelatively High
Risk Score96.4 / 100
Social Vulnerability24.7 / 100
Community Resilience99.2 / 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 50°F (10°C) 5.3 in
February 51°F (10°C) 6.0 in Wettest
March 51°F (11°C) 3.9 in
April 52°F (11°C) 2.2 in
May 53°F (12°C) 1.2 in
June 55°F (13°C) 0.5 in
July 57°F (14°C) 0.2 in
August 57°F (14°C) 0.1 in Driest
September 58°F (15°C) 0.2 in Warmest
October 56°F (13°C) 1.8 in
November 53°F (12°C) 2.9 in
December 50°F (10°C) 4.6 in Coldest

Tomales has a seasonal temperature swing of 8°F / from 50°F in December to 58°F in September. Total annual precipitation is 28.9 inches, with February being the wettest month (6.0") and August the driest (0.1").

View full profile of Tomales, CA →