Weather & Climate in Vacaville, CA

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

Vacaville enjoys a temperate climate with an average annual temperature of 60°F (15°C). Winters average 48°F in January while summers reach 74°F in July. The area gets 313 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 32.0 inches. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 171 feet.

Temperature

48°F Jan (9°C) 74°F Jul (23°C)

Annual Average	59.7°F
	11% above US avg
January Average	48°F (9°C)
July Average	74°F (23°C)
Sunny Days	313 days/yr

Geography

Elevation	171 ft (52 m)
Area	28.6 sq mi (74.0 km²)
Population Density	3,418/sq mi
Coordinates	38.3586°N, 121.9686°W
Timezone	America/Los_Angeles
County	Solano County County
Nearest Airport	Sacramento International (SMF) 31 miles away

Precipitation & Snow

Annual Rainfall 32.0"

16% below US avg

Snowfall 0.7"

Wettest Month (Jan) 5.08"

Driest Month (Jul) 0.04"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	97.0 / 100
Social Vulnerability	25.2 / 100
Community Resilience	71.8 / 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 Low
Winter Weather	Very Low
Lightning	Relatively Moderate
Drought	Relatively High
Cold Wave	No Rating
Landslide	Relatively High
Coastal Flood	Relatively High
Tsunami	Very Low
Volcano	Very Low
Avalanche	Very Low

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

Earthquake History

4,186 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	34 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	130 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	39 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	77 km	7 km
May 12, 2006	7 km W of Cobb, California	M4.7	89 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	113 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	87 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	80 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	94 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	87 km	3 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	118 km	4 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	89 km	2 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	137 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	54 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	90 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	91 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	87 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	85 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	87 km	1 km

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

Tornado History

82 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 2 injuries.

Date	Rating	Distance	Path	Fatalities
Feb 7, 1978	EF2	59 km	1.9 mi	0
Jun 1, 1958	EF2	89 km	15.0 mi	0
Dec 24, 2015	EF1	84 km	6.2 mi	0
Oct 22, 2012	EF1	89 km	0.3 mi	0
Oct 22, 2012	EF1	84 km	2.0 mi	0
Mar 18, 2011	EF1	65 km	0.1 mi	0
Jan 23, 2010	EF1	53 km	1.6 mi	0
Mar 20, 2005	EF1	88 km	3.0 mi	0
Dec 5, 1998	EF1	65 km	1.5 mi	0
Dec 23, 1996	EF1	85 km	6.0 mi	0
Feb 22, 1996	EF1	70 km	1.0 mi	0
Dec 2, 1992	EF1	81 km	7.5 mi	0
Dec 2, 1992	EF1	75 km	1.0 mi	0
Dec 2, 1992	EF1	77 km	3.0 mi	0
Apr 19, 1988	EF1	78 km	1.0 mi	0
Apr 19, 1988	EF1	75 km	0.2 mi	0
Mar 22, 1983	EF1	67 km	2.0 mi	0
Feb 27, 1983	EF1	65 km	0.8 mi	0
Jan 14, 1980	EF1	98 km	0.3 mi	0
May 31, 1967	EF1	73 km	0.1 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	74 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	147 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	100 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	87 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	129 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (97 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	97 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	40 km
2015	ROCKY	96,125	74 km
2018	COUNTY	92,450	40 km
2019	KINCADE	77,780	78 km
2015	VALLEY	77,507	74 km
2020	GLASS	68,020	55 km
2017	NUNS	56,883	47 km
2020	WALLBRIDGE	55,194	95 km
2017	ATLAS	51,664	23 km
2004	RUMSEY	39,335	52 km
1999	SIXTEEN	37,162	59 km
2017	TUBBS	36,981	66 km
1988	MILLER	35,750	14 km
2017	POCKET	18,691	92 km
2012	SIXTEEN COMPLEX	18,191	78 km
2024	CORRAL	16,138	92 km
2006	ZAM ASSIST	14,404	44 km
2008	WALKER	12,441	90 km
2004	GEYSERS	12,075	79 km
2009	CORRAL	12,006	95 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	5.1 in	Wettest
February	51°F (10°C)	4.3 in
March	55°F (13°C)	3.3 in
April	59°F (15°C)	1.0 in
May	66°F (19°C)	0.5 in
June	72°F (22°C)	0.1 in
July	74°F (23°C)	0.0 in	Warmest, Driest
August	74°F (23°C)	0.0 in
September	71°F (22°C)	0.3 in
October	64°F (18°C)	1.1 in
November	53°F (12°C)	3.0 in
December	46°F (8°C)	3.4 in	Coldest

Vacaville has a seasonal temperature swing of 28°F / from 46°F in December to 74°F in July. Total annual precipitation is 22.2 inches, with January being the wettest month (5.1") and July the driest (0.0").

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