Weather & Climate in Sunol, CA

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

Sunol enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 48°F in January while summers reach 73°F in July. The area gets 330 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 14.6 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 164 feet.

Temperature

48°F Jan (9°C) 73°F Jul (23°C)

Annual Average	60.4°F
	12% above US avg
January Average	48°F (9°C)
July Average	73°F (23°C)
Sunny Days	330 days/yr

Geography

Elevation	164 ft (50 m)
Area	27.8 sq mi (71.9 km²)
Population Density	33/sq mi
Coordinates	37.5859°N, 121.8805°W
Timezone	America/Los_Angeles
County	Alameda County County
Nearest Airport	Norman Y Mineta San Jose International (SJC) 16 miles away

Precipitation & Snow

Annual Rainfall 14.6"

62% below US avg

Snowfall 0.0"

Wettest Month (Jan) 3.78"

Driest Month (Jul) 0.04"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very High
Risk Score	99.8 / 100
Social Vulnerability	27.5 / 100
Community Resilience	91.2 / 100

Hazard Breakdown

Tornado	Relatively Moderate
Earthquake	Very High
Wildfire	Relatively High
Flood	Very High
Hail	Relatively Low
Strong Wind	Very Low
Heat Wave	Relatively High
Winter Weather	Very Low
Lightning	Relatively Low
Drought	Relatively Moderate
Cold Wave	No Rating
Landslide	Relatively High
Coastal Flood	Relatively High
Tsunami	Relatively Low
Volcano	Very Low
Avalanche	Very Low

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

Earthquake History

4,240 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	80 km	11 km
Apr 18, 1990	5 km NNW of Aromas, California	M5.4	75 km	5 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	72 km	7 km
Aug 12, 1998	10 km SW of Ridgemark, California	M5.1	100 km	9 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	73 km	7 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	100 km	9 km
Apr 18, 1990	4 km NNW of Aromas, California	M4.9	76 km	6 km
May 14, 2002	5 km SSW of Gilroy, California	M4.9	73 km	7 km
Apr 23, 1995	22 km NNE of Soledad, California	M4.9	125 km	7 km
Apr 19, 1996	2 km E of Aromas, California	M4.9	81 km	5 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	144 km	7 km
Apr 18, 1990	4 km N of Aromas, California	M4.7	76 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	29 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	35 km	9 km
Aug 27, 2011	21 km NE of Soledad, California	M4.6	128 km	8 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	79 km	8 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	70 km	15 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	54 km	4 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	106 km	9 km
Jan 12, 2011	9 km SSE of San Juan Bautista, California	M4.5	97 km	8 km

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

Tornado History

66 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 10 injuries.

Date	Rating	Distance	Path	Fatalities
May 5, 1998	EF2	27 km	0.6 mi	0
Mar 11, 1985	EF2	92 km	0.5 mi	0
Apr 27, 1953	EF2	78 km	0.1 mi	0
Jan 11, 1951	EF2	32 km	5.7 mi	0
Dec 14, 2024	EF1	61 km	0.3 mi	0
Nov 15, 2015	EF1	94 km	3.0 mi	0
Jan 23, 2010	EF1	38 km	1.6 mi	0
Apr 14, 2006	EF1	78 km	0.5 mi	0
Mar 20, 2005	EF1	48 km	3.0 mi	0
Dec 20, 2001	EF1	69 km	0.5 mi	0
May 5, 1998	EF1	31 km	0.3 mi	0
Dec 12, 1996	EF1	93 km	0.6 mi	0
Apr 19, 1988	EF1	91 km	0.2 mi	0
Jan 14, 1980	EF1	12 km	0.3 mi	0
Mar 4, 1978	EF1	93 km	2.5 mi	0
Mar 4, 1978	EF1	93 km	1.0 mi	0
Mar 1, 1978	EF1	84 km	1.5 mi	0
May 31, 1967	EF1	67 km	0.1 mi	0
Apr 1, 1965	EF1	68 km	0.1 mi	0
Apr 1, 1958	EF1	98 km	2.0 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	23 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	61 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	-	38 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	-	56 km
1865	N. CALIFORNIA	Eruption + Earthquake	-	-	43 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (172 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	172 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: SCU LIGHTNING COMPLEX (405,787 acres, 2020).

Year	Name	Acres Burned	Distance
2020	SCU LIGHTNING COMPLEX	405,787	35 km
2020	CZU AUG LIGHTNING	85,894	57 km
2017	ATLAS	51,664	92 km
2007	LICK	47,424	57 km
2006	CANYON	36,851	54 km
1988	MILLER	35,750	96 km
2003	ANNIE	17,383	69 km
2024	CORRAL	16,138	38 km
2009	CORRAL	12,006	35 km
1985	LEXINGTON	11,550	49 km
2009	LOCKHEED	8,287	63 km
2003	BIRD	7,727	48 km
1984	SITE 300 3	6,911	37 km
2005	TESLA	6,638	29 km
2003	DEL PUERTO	6,441	46 km
2006	MIDWAY	6,243	33 km
2020	CREWS	5,802	74 km
2003	DEVIL	4,975	29 km
2020	WOODWARD	4,952	96 km
2003	JUMP	4,817	39 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	3.8 in	Coldest, Wettest
February	51°F (11°C)	3.1 in
March	54°F (12°C)	3.0 in
April	57°F (14°C)	1.3 in
May	61°F (16°C)	0.4 in
June	66°F (19°C)	0.1 in
July	73°F (23°C)	0.0 in	Warmest, Driest
August	70°F (21°C)	0.1 in
September	69°F (20°C)	0.3 in
October	64°F (18°C)	1.1 in
November	55°F (13°C)	2.7 in
December	49°F (9°C)	2.9 in

Sunol has a seasonal temperature swing of 25°F / from 48°F in January to 73°F in July. Total annual precipitation is 18.8 inches, with January being the wettest month (3.8") and July the driest (0.0").

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