Weather & Climate in Tamalpais-Homestead Valley, CA

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

Tamalpais-Homestead Valley enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 49°F in January while summers reach 68°F in July / relatively mild seasonal variation. The area gets 305 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 44.4 inches. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 32 feet.

Temperature

49°F Jan (10°C) 68°F Jul (20°C)

Annual Average	59.3°F
	10% above US avg
January Average	49°F (10°C)
July Average	68°F (20°C)
Sunny Days	305 days/yr

Geography

Elevation	32 ft (10 m)
Area	4.7 sq mi (12.1 km²)
Population Density	2,591/sq mi
Coordinates	37.8791°N, 122.5379°W
Timezone	America/Los_Angeles
County	San Mateo County County
Nearest Airport	San Francisco International (SFO) 20 miles away

Precipitation & Snow

Annual Rainfall 44.4"

17% above US avg

Snowfall 0.0"

Wettest Month (Jan) 9.02"

Driest Month (Jul) 0.08"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	99.2 / 100
Social Vulnerability	20.5 / 100
Community Resilience	97.6 / 100

Hazard Breakdown

Tornado	Relatively Low
Earthquake	Relatively High
Wildfire	Relatively Moderate
Flood	Relatively High
Hail	Very Low
Strong Wind	Relatively 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 High
Tsunami	Relatively Moderate

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

Earthquake History

4,837 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	42 km	11 km
Apr 18, 1990	5 km NNW of Aromas, California	M5.4	131 km	5 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	127 km	7 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	135 km	7 km
May 14, 2002	5 km SSW of Gilroy, California	M4.9	131 km	7 km
Apr 19, 1996	2 km E of Aromas, California	M4.9	137 km	5 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	57 km	9 km
Apr 18, 1990	4 km NNW of Aromas, California	M4.9	131 km	6 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	91 km	7 km
May 12, 2006	7 km W of Cobb, California	M4.7	107 km	4 km
Apr 18, 1990	4 km N of Aromas, California	M4.7	132 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	92 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	99 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	109 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	13 km	8 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	124 km	15 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	104 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	108 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	107 km	2 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	120 km	4 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
May 5, 1998	EF2	72 km	0.6 mi	0
Jun 1, 1958	EF2	59 km	15.0 mi	0
Jan 11, 1951	EF2	68 km	5.7 mi	0
Mar 18, 2011	EF1	66 km	0.1 mi	0
Jan 23, 2010	EF1	68 km	1.6 mi	0
Mar 20, 2005	EF1	28 km	3.0 mi	0
Jan 27, 2005	EF1	97 km	0.5 mi	0
Dec 5, 1998	EF1	65 km	1.5 mi	0
May 5, 1998	EF1	67 km	0.3 mi	0
Dec 23, 1996	EF1	54 km	6.0 mi	0
Feb 22, 1996	EF1	77 km	1.0 mi	0
Dec 2, 1992	EF1	63 km	1.0 mi	0
Dec 2, 1992	EF1	66 km	7.5 mi	0
Dec 2, 1992	EF1	79 km	3.0 mi	0
Feb 27, 1983	EF1	65 km	0.8 mi	0
Jan 14, 1980	EF1	73 km	0.3 mi	0
Nov 10, 1964	EF1	76 km	1.0 mi	0
Feb 17, 1959	EF1	95 km	0.5 mi	0
Apr 1, 1958	EF1	33 km	0.2 mi	0
Apr 27, 2016	EF0	79 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	43 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	110 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	47 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	20 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	94 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (123 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	123 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	86 km
2018	COUNTY	92,450	95 km
2020	CZU AUG LIGHTNING	85,894	86 km
2019	KINCADE	77,780	91 km
2020	GLASS	68,020	75 km
2017	NUNS	56,883	52 km
2020	WALLBRIDGE	55,194	92 km
2017	ATLAS	51,664	60 km
2017	TUBBS	36,981	78 km
1988	MILLER	35,750	73 km
2024	CORRAL	16,138	99 km
2004	GEYSERS	12,075	96 km
2009	CORRAL	12,006	98 km
1995	VISION	11,931	34 km
1985	LEXINGTON	11,550	98 km
2015	WRAGG	8,455	79 km
2009	LOCKHEED	8,287	93 km
2014	MONTICELLO	6,984	84 km
1984	SITE 300 3	6,911	97 km
2005	TESLA	6,638	89 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	49°F (10°C)	9.0 in	Wettest
February	51°F (11°C)	7.5 in
March	53°F (11°C)	6.3 in
April	55°F (13°C)	2.6 in
May	58°F (15°C)	0.8 in
June	62°F (16°C)	0.2 in
July	68°F (20°C)	0.1 in	Warmest, Driest
August	65°F (18°C)	0.2 in
September	65°F (18°C)	0.4 in
October	62°F (16°C)	2.2 in
November	54°F (12°C)	6.3 in
December	49°F (10°C)	7.6 in	Coldest

Tamalpais-Homestead Valley has a seasonal temperature swing of 19°F / from 49°F in December to 68°F in July. Total annual precipitation is 43.3 inches, with January being the wettest month (9.0") and July the driest (0.1").

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