Weather & Climate in Napa, CA

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

Napa enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 48°F in January while summers reach 68°F in July. The area gets 316 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 40.2 inches. The area receives 3.0 inches of snow annually. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 49 feet.

Temperature

48°F Jan (9°C) 68°F Jul (20°C)

Annual Average	56.6°F
	5% above US avg
January Average	48°F (9°C)
July Average	68°F (20°C)
Sunny Days	316 days/yr

Geography

Elevation	49 ft (15 m)
Area	18.1 sq mi (46.7 km²)
Population Density	4,367/sq mi
Coordinates	38.2979°N, 122.3007°W
Timezone	America/Los_Angeles
County	Napa County County
Nearest Airport	Metro Oakland International (OAK) 40 miles away

Precipitation & Snow

Annual Rainfall 40.2"

6% above US avg

Snowfall 3.0"

Wettest Month (Jan) 6.14"

Driest Month (Jul) 0.04"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	95.3 / 100
Social Vulnerability	38.5 / 100
Community Resilience	76.0 / 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	Very High
Cold Wave	No Rating
Landslide	Relatively High
Coastal Flood	Relatively Moderate
Tsunami	Very Low
Volcano	Very Low
Avalanche	Very Low

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

Earthquake History

4,312 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	9 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	123 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	13 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	58 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	147 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	73 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	116 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	123 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	73 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	55 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	75 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	72 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	73 km	2 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	130 km	4 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	122 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	26 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	73 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	76 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	70 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	69 km	4 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Feb 7, 1978	EF2	87 km	1.9 mi	0
Jun 1, 1958	EF2	59 km	15.0 mi	0
Mar 18, 2011	EF1	39 km	0.1 mi	0
Jan 23, 2010	EF1	63 km	1.6 mi	0
Mar 20, 2005	EF1	73 km	3.0 mi	0
Jan 27, 2005	EF1	80 km	0.5 mi	0
Dec 5, 1998	EF1	39 km	1.5 mi	0
Dec 23, 1996	EF1	55 km	6.0 mi	0
Feb 22, 1996	EF1	47 km	1.0 mi	0
Dec 2, 1992	EF1	53 km	3.0 mi	0
Dec 2, 1992	EF1	48 km	1.0 mi	0
Dec 2, 1992	EF1	54 km	7.5 mi	0
Mar 22, 1983	EF1	95 km	2.0 mi	0
Feb 27, 1983	EF1	39 km	0.8 mi	0
Jan 14, 1980	EF1	98 km	0.3 mi	0
May 31, 1967	EF1	95 km	0.1 mi	0
Nov 10, 1964	EF1	51 km	1.0 mi	0
Feb 17, 1959	EF1	86 km	0.5 mi	0
Apr 1, 1958	EF1	76 km	0.2 mi	0
Nov 8, 2022	EF0	86 km	0.8 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	69 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	145 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	-	89 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	-	69 km
1865	N. CALIFORNIA	Eruption + Earthquake	-	-	127 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (85 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	85 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	36 km
2015	ROCKY	96,125	69 km
2018	COUNTY	92,450	45 km
2019	KINCADE	77,780	59 km
2015	VALLEY	77,507	61 km
2020	GLASS	68,020	36 km
2017	NUNS	56,883	19 km
2020	WALLBRIDGE	55,194	71 km
2017	ATLAS	51,664	9 km
2004	RUMSEY	39,335	51 km
1999	SIXTEEN	37,162	56 km
2017	TUBBS	36,981	45 km
1988	MILLER	35,750	23 km
2017	POCKET	18,691	73 km
2012	SIXTEEN COMPLEX	18,191	79 km
2006	ZAM ASSIST	14,404	61 km
2008	WALKER	12,441	87 km
2004	GEYSERS	12,075	62 km
1995	VISION	11,931	57 km
1985	UNNAMED	9,655	79 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	6.1 in	Wettest
February	51°F (10°C)	5.2 in
March	53°F (12°C)	4.2 in
April	57°F (14°C)	1.5 in
May	62°F (17°C)	0.7 in
June	67°F (20°C)	0.2 in
July	68°F (20°C)	0.0 in	Driest
August	70°F (21°C)	0.1 in	Warmest
September	69°F (20°C)	0.4 in
October	63°F (17°C)	1.6 in
November	53°F (12°C)	4.1 in
December	47°F (8°C)	4.5 in	Coldest

Napa has a seasonal temperature swing of 24°F / from 47°F in December to 70°F in August. Total annual precipitation is 28.7 inches, with January being the wettest month (6.1") and July the driest (0.0").

View full profile of Napa, CA →