Weather & Climate in Antioch, CA

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

Antioch enjoys a temperate climate with an average annual temperature of 60°F (15°C). Winters average 48°F in January while summers reach 75°F in July. The area gets 322 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 31.2 inches. The area receives 1.7 inches of snow annually. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 226 feet.

Temperature

48°F Jan (9°C) 75°F Jul (24°C)

Annual Average	59.8°F
	11% above US avg
January Average	48°F (9°C)
July Average	75°F (24°C)
Sunny Days	322 days/yr

Geography

Elevation	226 ft (69 m)
Area	29.1 sq mi (75.3 km²)
Population Density	3,968/sq mi
Coordinates	37.9783°N, 121.7961°W
Timezone	America/Los_Angeles
County	Contra Costa County County
Nearest Airport	Metro Oakland International (OAK) 29 miles away

Precipitation & Snow

Annual Rainfall 31.2"

18% below US avg

Snowfall 1.7"

Wettest Month (Jan) 3.19"

Driest Month (Jul) 0.04"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very High
Risk Score	99.5 / 100
Social Vulnerability	21.5 / 100
Community Resilience	67.8 / 100

Hazard Breakdown

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

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

Earthquake History

5,280 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	52 km	11 km
Apr 18, 1990	5 km NNW of Aromas, California	M5.4	117 km	5 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	114 km	7 km
Aug 12, 1998	10 km SW of Ridgemark, California	M5.1	139 km	9 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	111 km	7 km
May 14, 2002	5 km SSW of Gilroy, California	M4.9	114 km	7 km
Apr 18, 1990	4 km NNW of Aromas, California	M4.9	117 km	6 km
Apr 19, 1996	2 km E of Aromas, California	M4.9	123 km	5 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	70 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	114 km	7 km
May 12, 2006	7 km W of Cobb, California	M4.7	129 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	69 km	8 km
Apr 18, 1990	4 km N of Aromas, California	M4.7	118 km	4 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	75 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	128 km	1 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	113 km	15 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	79 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	131 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	128 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	129 km	2 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
May 5, 1998	EF2	71 km	0.6 mi	0
Feb 7, 1978	EF2	86 km	1.9 mi	0
Apr 27, 1953	EF2	79 km	0.1 mi	0
Jan 11, 1951	EF2	73 km	5.7 mi	0
Jan 10, 2023	EF1	92 km	0.4 mi	0
Nov 15, 2015	EF1	100 km	3.0 mi	0
Mar 18, 2011	EF1	96 km	0.1 mi	0
Jan 23, 2010	EF1	8 km	1.6 mi	0
Apr 14, 2006	EF1	79 km	0.5 mi	0
Mar 20, 2005	EF1	66 km	3.0 mi	0
Dec 5, 1998	EF1	95 km	1.5 mi	0
May 5, 1998	EF1	72 km	0.3 mi	0
Dec 12, 1996	EF1	86 km	0.6 mi	0
Apr 19, 1988	EF1	60 km	0.2 mi	0
Apr 19, 1988	EF1	95 km	1.0 mi	0
Mar 22, 1983	EF1	91 km	2.0 mi	0
Feb 27, 1983	EF1	95 km	0.8 mi	0
Jan 14, 1980	EF1	56 km	0.3 mi	0
Mar 4, 1978	EF1	93 km	2.5 mi	0
Mar 1, 1978	EF1	83 km	1.5 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	41 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	105 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	69 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	69 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	87 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (139 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	139 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	60 km
2020	HENNESSEY	314,241	83 km
2018	COUNTY	92,450	84 km
2020	CZU AUG LIGHTNING	85,894	100 km
2020	GLASS	68,020	92 km
2017	NUNS	56,883	74 km
2017	ATLAS	51,664	58 km
2007	LICK	47,424	90 km
2004	RUMSEY	39,335	96 km
2006	CANYON	36,851	79 km
1988	MILLER	35,750	57 km
2003	ANNIE	17,383	96 km
2024	CORRAL	16,138	48 km
2006	ZAM ASSIST	14,404	87 km
2018	WAVERLY	12,238	83 km
2009	CORRAL	12,006	51 km
1995	VISION	11,931	94 km
1985	LEXINGTON	11,550	93 km
1996	SCOTT	8,828	92 km
2015	WRAGG	8,455	61 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	3.2 in	Wettest
February	51°F (11°C)	2.6 in
March	54°F (12°C)	2.1 in
April	58°F (15°C)	1.0 in
May	64°F (18°C)	0.4 in
June	70°F (21°C)	0.1 in
July	75°F (24°C)	0.0 in	Warmest, Driest
August	74°F (23°C)	0.1 in
September	71°F (22°C)	0.2 in
October	65°F (18°C)	0.9 in
November	54°F (12°C)	2.2 in
December	47°F (8°C)	2.3 in	Coldest

Antioch has a seasonal temperature swing of 28°F / from 47°F in December to 75°F in July. Total annual precipitation is 15.2 inches, with January being the wettest month (3.2") and July the driest (0.0").

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