Weather & Climate in Cotati, CA

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

Cotati enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 48°F in January while summers reach 67°F in July / relatively mild seasonal variation. Annual precipitation totals 25.6 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 108 feet.

Temperature

48°F Jan (9°C) 67°F Jul (19°C)
Annual Average58.0°F
7% above US avg
January Average48°F (9°C)
July Average67°F (19°C)

Geography

Elevation108 ft (33 m)
Area1.9 sq mi (4.8 km²)
Population Density4,028/sq mi
Coordinates38.3285°N, 122.7100°W
TimezoneAmerica/Los_Angeles
CountySonoma County County
Nearest AirportMetro Oakland International (OAK)
50 miles away

Precipitation & Snow

Annual Rainfall 25.6"
33% below US avg
Snowfall 0.0"
Wettest Month (Feb) 5.23"
Driest Month (Jul) 0.01"

Air Quality

AQI Median19.0
RatingGood
Good Days %95.1%
Unhealthy Days0

Natural Hazard Risk

Overall RiskRelatively High
Risk Score99.1 / 100
Social Vulnerability29.8 / 100
Community Resilience66.2 / 100

Hazard Breakdown

Tornado Very Low
Earthquake Relatively High
Wildfire Relatively High
Flood Relatively High
Hail Very Low
Strong Wind Very Low
Heat Wave Relatively Moderate
Winter Weather Very Low
Lightning Relatively Moderate
Drought Relatively High
Cold Wave No Rating
Landslide Relatively High
Coastal Flood Relatively Moderate
Tsunami Very Low
Volcano Relatively Low
Avalanche Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

4,181 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 37 km 11 km
Aug 10, 2016 20 km NNE of Upper Lake, California M5.1 112 km 14 km
Sep 3, 2000 5 km WSW of Yountville, California M4.9 27 km 9 km
Sep 4, 1995 13 km SW of Middletown, California M4.8 40 km 7 km
Apr 18, 2007 15 km N of Potter Valley, California M4.8 131 km 5 km
May 12, 2006 7 km W of Cobb, California M4.7 55 km 4 km
May 21, 1996 8 km ESE of East Foothills, California M4.7 138 km 8 km
Aug 11, 1993 14 km ESE of Alum Rock, California M4.7 145 km 9 km
Jan 2, 2025 4 km NW of Cobb, CA M4.7 58 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 52 km 6 km
Feb 18, 2004 4 km WNW of Cobb, California M4.6 57 km 3 km
Jan 12, 2014 8 km W of Cobb, California M4.5 55 km 2 km
Sep 25, 2012 3 km N of Talmage, California M4.5 101 km 11 km
Aug 3, 2006 5 km W of Glen Ellen, California M4.5 11 km 9 km
Jun 8, 2024 7 km NW of The Geysers, CA M4.5 55 km 4 km
Sep 19, 1992 7 km NW of Cobb, California M4.5 60 km 3 km
Apr 24, 2007 7 km WSW of Cobb, California M4.5 52 km 2 km
Jun 3, 2023 2km NW of The Geysers, CA M4.5 52 km 4 km
Mar 14, 2013 5 km W of Cobb, California M4.4 54 km 1 km
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.

Tornado History

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

Date Rating Distance Path Fatalities
Jun 1, 1958 EF2 24 km 15.0 mi 0
Mar 18, 2011 EF1 14 km 0.1 mi 0
Jan 23, 2010 EF1 95 km 1.6 mi 0
Mar 20, 2005 EF1 80 km 3.0 mi 0
Jan 27, 2005 EF1 48 km 0.5 mi 0
Dec 5, 1998 EF1 14 km 1.5 mi 0
Dec 23, 1996 EF1 21 km 6.0 mi 0
Feb 22, 1996 EF1 25 km 1.0 mi 0
Dec 2, 1992 EF1 26 km 3.0 mi 0
Dec 2, 1992 EF1 18 km 7.5 mi 0
Dec 2, 1992 EF1 13 km 1.0 mi 0
Feb 27, 1983 EF1 14 km 0.8 mi 0
Nov 10, 1964 EF1 24 km 1.0 mi 0
Feb 17, 1959 EF1 52 km 0.5 mi 0
Apr 1, 1958 EF1 85 km 0.2 mi 0
Sep 28, 2019 EF0 88 km 1.7 mi 0
Apr 27, 2016 EF0 56 km 0.2 mi 0
Feb 28, 2014 EF0 94 km 0.7 mi 0
Apr 7, 2011 EF0 52 km 0.1 mi 0
Mar 20, 2005 EF0 85 km 1.2 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 88 km
1856 N. CALIFORNIA Eruption + Earthquake 0.6 m - 99 km
1906 N. CALIFORNIA Eruption + Earthquake 0.1 m - 72 km
1865 N. CALIFORNIA Eruption + Earthquake - - 144 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (72 km).

Name Type Elevation Last Eruption Distance
Clear Lake Volcanic field 1,439 m (4,721 ft) Unknown 72 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 50 km
2015 ROCKY 96,125 69 km
2018 COUNTY 92,450 62 km
1996 FORK 83,209 97 km
2019 KINCADE 77,780 39 km
2015 VALLEY 77,507 52 km
2020 GLASS 68,020 29 km
2017 NUNS 56,883 18 km
2020 WALLBRIDGE 55,194 42 km
2017 ATLAS 51,664 41 km
2018 RIVER 48,920 85 km
2004 RUMSEY 39,335 61 km
1999 SIXTEEN 37,162 62 km
2017 TUBBS 36,981 27 km
1988 MILLER 35,750 55 km
2017 POCKET 18,691 51 km
2012 SIXTEEN COMPLEX 18,191 84 km
2006 ZAM ASSIST 14,404 85 km
2008 WALKER 12,441 84 km
2004 GEYSERS 12,075 45 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 48°F (9°C) 4.8 in
February 51°F (10°C) 5.2 in Wettest
March 53°F (12°C) 3.3 in
April 56°F (13°C) 1.7 in
May 60°F (15°C) 0.9 in
June 64°F (18°C) 0.3 in
July 67°F (19°C) 0.0 in Driest
August 67°F (19°C) 0.1 in Warmest
September 67°F (19°C) 0.1 in
October 62°F (17°C) 1.3 in
November 54°F (12°C) 2.7 in
December 48°F (9°C) 5.2 in Coldest

Cotati has a seasonal temperature swing of 19°F / from 48°F in December to 67°F in August. Total annual precipitation is 25.6 inches, with February being the wettest month (5.2") and July the driest (0.0").

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