Weather & Climate in Vallejo, CA

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

Vallejo 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 20.2 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 28 / among the cleanest air in the country. 86% of days have good air quality. The city sits at an elevation of 102 feet.

Temperature

48°F Jan (9°C) 67°F Jul (19°C)

Annual Average	57.7°F
	7% above US avg
January Average	48°F (9°C)
July Average	67°F (19°C)

Geography

Elevation	102 ft (31 m)
Area	49.5 sq mi (128.3 km²)
Population Density	4,095/sq mi
Coordinates	38.1069°N, 122.2623°W
Timezone	America/Los_Angeles
County	Marin County County
Nearest Airport	Metro Oakland International (OAK) 27 miles away

Precipitation & Snow

Annual Rainfall 20.2"

47% below US avg

Snowfall 0.0"

Wettest Month (Jan) 4.17"

Driest Month (Jul) 0.01"

Air Quality

AQI Median	28.0
Rating	Good
Good Days %	86.3%
Unhealthy Days	0

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	96.4 / 100
Social Vulnerability	24.7 / 100
Community Resilience	99.2 / 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

4,551 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	13 km	11 km
Apr 18, 1990	5 km NNW of Aromas, California	M5.4	141 km	5 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	138 km	7 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	144 km	14 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	140 km	7 km
Apr 19, 1996	2 km E of Aromas, California	M4.9	147 km	5 km
Apr 18, 1990	4 km NNW of Aromas, California	M4.9	141 km	6 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	33 km	9 km
May 14, 2002	5 km SSW of Gilroy, California	M4.9	140 km	7 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	92 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	96 km	8 km
Apr 18, 1990	4 km N of Aromas, California	M4.7	142 km	4 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	102 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	93 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	43 km	8 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	136 km	15 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	93 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	92 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	92 km	2 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
May 5, 1998	EF2	84 km	0.6 mi	0
Feb 7, 1978	EF2	97 km	1.9 mi	0
Jun 1, 1958	EF2	66 km	15.0 mi	0
Jan 11, 1951	EF2	83 km	5.7 mi	0
Mar 18, 2011	EF1	55 km	0.1 mi	0
Jan 23, 2010	EF1	49 km	1.6 mi	0
Mar 20, 2005	EF1	53 km	3.0 mi	0
Jan 27, 2005	EF1	94 km	0.5 mi	0
Dec 5, 1998	EF1	54 km	1.5 mi	0
May 5, 1998	EF1	82 km	0.3 mi	0
Dec 23, 1996	EF1	61 km	6.0 mi	0
Feb 22, 1996	EF1	64 km	1.0 mi	0
Dec 2, 1992	EF1	69 km	3.0 mi	0
Dec 2, 1992	EF1	65 km	7.5 mi	0
Dec 2, 1992	EF1	59 km	1.0 mi	0
Apr 19, 1988	EF1	98 km	0.2 mi	0
Feb 27, 1983	EF1	54 km	0.8 mi	0
Jan 14, 1980	EF1	77 km	0.3 mi	0
May 31, 1967	EF1	86 km	0.1 mi	0
Nov 10, 1964	EF1	66 km	1.0 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	47 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	124 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	-	68 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	-	50 km
1865	N. CALIFORNIA	Eruption + Earthquake	-	-	106 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: SCU LIGHTNING COMPLEX (405,787 acres, 2020).

Year	Name	Acres Burned	Distance
2020	SCU LIGHTNING COMPLEX	405,787	96 km
2020	HENNESSEY	314,241	57 km
2015	ROCKY	96,125	91 km
2018	COUNTY	92,450	65 km
2019	KINCADE	77,780	77 km
2015	VALLEY	77,507	82 km
2020	GLASS	68,020	55 km
2017	NUNS	56,883	34 km
2020	WALLBRIDGE	55,194	86 km
2017	ATLAS	51,664	29 km
2004	RUMSEY	39,335	72 km
1999	SIXTEEN	37,162	78 km
2017	TUBBS	36,981	63 km
1988	MILLER	35,750	39 km
2017	POCKET	18,691	91 km
2024	CORRAL	16,138	88 km
2006	ZAM ASSIST	14,404	78 km
2004	GEYSERS	12,075	81 km
2009	CORRAL	12,006	89 km
1995	VISION	11,931	53 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	4.2 in	Wettest
February	50°F (10°C)	4.0 in
March	53°F (12°C)	3.0 in
April	56°F (13°C)	1.3 in
May	61°F (16°C)	0.8 in
June	65°F (18°C)	0.2 in
July	67°F (19°C)	0.0 in	Driest
August	67°F (20°C)	0.0 in	Warmest
September	66°F (19°C)	0.1 in
October	61°F (16°C)	0.9 in
November	53°F (12°C)	2.0 in
December	48°F (9°C)	3.8 in	Coldest

Vallejo has a seasonal temperature swing of 20°F / from 48°F in December to 67°F in August. Total annual precipitation is 20.2 inches, with January being the wettest month (4.2") and July the driest (0.0").

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