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Weather & Climate in Lagunitas-Forest Knolls, CA

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

Lagunitas-Forest Knolls 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. 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 25.6 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 328 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)
Sunny Days326 days/yr

Geography

Elevation328 ft (100 m)
Area4.3 sq mi (11.0 km²)
Population Density422/sq mi
Coordinates38.0180°N, 122.6913°W
TimezoneAmerica/Los_Angeles
CountyMarin County County
Nearest AirportSan Francisco International (SFO)
33 miles away

Precipitation & Snow

Annual Rainfall 25.6"
33% below US avg
Snowfall 0.0"
Wettest Month (Jan) 8.66"
Driest Month (Jul) 0.08"

Air Quality

AQI Median48.0
RatingGood

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

4,194 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 40 km 11 km
Apr 18, 1990 4 km E of Interlaken, California M5.1 148 km 7 km
Aug 10, 2016 20 km NNE of Upper Lake, California M5.1 146 km 14 km
Sep 3, 2000 5 km WSW of Yountville, California M4.9 47 km 9 km
Sep 4, 1995 13 km SW of Middletown, California M4.8 74 km 7 km
May 12, 2006 7 km W of Cobb, California M4.7 90 km 4 km
May 21, 1996 8 km ESE of East Foothills, California M4.7 112 km 8 km
Aug 11, 1993 14 km ESE of Alum Rock, California M4.7 119 km 9 km
Jan 2, 2025 4 km NW of Cobb, CA M4.7 92 km 1 km
Mar 24, 1991 1 km NNE of Interlaken, California M4.6 145 km 15 km
Aug 18, 1999 0 km S of Bolinas, California M4.6 12 km 8 km
Jan 11, 2000 6 km N of Geyserville, California M4.6 86 km 6 km
Feb 18, 2004 4 km WNW of Cobb, California M4.6 91 km 3 km
Jan 12, 2014 8 km W of Cobb, California M4.5 89 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 M4.5 134 km 11 km
Aug 3, 2006 5 km W of Glen Ellen, California M4.5 39 km 9 km
Jun 8, 2024 7 km NW of The Geysers, CA M4.5 89 km 4 km
Sep 19, 1992 7 km NW of Cobb, California M4.5 94 km 3 km
Apr 24, 2007 7 km WSW of Cobb, California M4.5 87 km 2 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

35 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 4 injuries.

Date Rating Distance Path Fatalities
May 5, 1998 EF2 93 km 0.6 mi 0
Jun 1, 1958 EF2 39 km 15.0 mi 0
Jan 11, 1951 EF2 88 km 5.7 mi 0
Mar 18, 2011 EF1 48 km 0.1 mi 0
Jan 23, 2010 EF1 82 km 1.6 mi 0
Mar 20, 2005 EF1 47 km 3.0 mi 0
Jan 27, 2005 EF1 77 km 0.5 mi 0
Dec 5, 1998 EF1 48 km 1.5 mi 0
May 5, 1998 EF1 87 km 0.3 mi 0
Dec 23, 1996 EF1 33 km 6.0 mi 0
Feb 22, 1996 EF1 59 km 1.0 mi 0
Dec 2, 1992 EF1 60 km 3.0 mi 0
Dec 2, 1992 EF1 44 km 1.0 mi 0
Dec 2, 1992 EF1 46 km 7.5 mi 0
Feb 27, 1983 EF1 48 km 0.8 mi 0
Jan 14, 1980 EF1 93 km 0.3 mi 0
Nov 10, 1964 EF1 58 km 1.0 mi 0
Feb 17, 1959 EF1 74 km 0.5 mi 0
Apr 1, 1958 EF1 54 km 0.2 mi 0
Apr 27, 2016 EF0 74 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 63 km
1989 N. CALIFORNIA Earthquake 1.0 m 62 130 km
1856 N. CALIFORNIA Eruption + Earthquake 0.6 m — 67 km
1906 N. CALIFORNIA Eruption + Earthquake 0.1 m — 39 km
1865 N. CALIFORNIA Eruption + Earthquake — — 115 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (106 km).

Name Type Elevation Last Eruption Distance
Clear Lake Volcanic field 1,439 m (4,721 ft) Unknown 106 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 76 km
2018 COUNTY 92,450 88 km
2019 KINCADE 77,780 73 km
2015 VALLEY 77,507 86 km
2020 GLASS 68,020 61 km
2017 NUNS 56,883 40 km
2020 WALLBRIDGE 55,194 72 km
2017 ATLAS 51,664 55 km
2004 RUMSEY 39,335 90 km
1999 SIXTEEN 37,162 93 km
2017 TUBBS 36,981 61 km
1988 MILLER 35,750 69 km
2017 POCKET 18,691 85 km
2004 GEYSERS 12,075 79 km
1995 VISION 11,931 15 km
1985 UNNAMED 9,655 95 km
2015 WRAGG 8,455 75 km
2014 MONTICELLO 6,984 79 km
2016 COLD 6,289 79 km
1985 BALD MT. 5,339 96 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 48°F (9°C) 8.7 in Coldest, Wettest
February 51°F (11°C) 7.2 in
March 52°F (11°C) 6.0 in
April 55°F (13°C) 2.4 in
May 58°F (14°C) 0.9 in
June 61°F (16°C) 0.2 in
July 67°F (19°C) 0.1 in Warmest, Driest
August 65°F (18°C) 0.2 in
September 65°F (18°C) 0.5 in
October 61°F (16°C) 2.3 in
November 54°F (12°C) 6.1 in
December 49°F (9°C) 7.2 in

Lagunitas-Forest Knolls has a seasonal temperature swing of 18°F / from 48°F in January to 67°F in July. Total annual precipitation is 41.7 inches, with January being the wettest month (8.7") and July the driest (0.1").

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