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Weather & Climate in Isleton, CA

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

Isleton enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 48°F in January while summers reach 77°F in July. The area gets 326 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 24.8 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 -1 feet.

Temperature

48°F Jan (9°C) 77°F Jul (25°C)
Annual Average62.1°F
15% above US avg
January Average48°F (9°C)
July Average77°F (25°C)
Sunny Days326 days/yr

Geography

Elevation-1 ft (0 m)
Area0.5 sq mi (1.3 km²)
Population Density1,475/sq mi
Coordinates38.1613°N, 121.6050°W
TimezoneAmerica/Los_Angeles
CountySolano County County
Nearest AirportSacramento International (SMF)
37 miles away

Precipitation & Snow

Annual Rainfall 24.8"
35% below US avg
Wettest Month (Jan) 3.07"
Driest Month (Jul) 0.04"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively High
Risk Score97.0 / 100
Social Vulnerability25.2 / 100
Community Resilience71.8 / 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

4,781 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 62 km 11 km
Apr 18, 1990 5 km NNW of Aromas, California M5.4 137 km 5 km
Apr 18, 1990 4 km E of Interlaken, California M5.1 134 km 7 km
Jan 16, 1993 9 km E of Gilroy, California M4.9 128 km 7 km
May 14, 2002 5 km SSW of Gilroy, California M4.9 133 km 7 km
Apr 18, 1990 4 km NNW of Aromas, California M4.9 137 km 6 km
Sep 3, 2000 5 km WSW of Yountville, California M4.9 75 km 9 km
Apr 19, 1996 2 km E of Aromas, California M4.9 142 km 5 km
Sep 4, 1995 13 km SW of Middletown, California M4.8 115 km 7 km
May 12, 2006 7 km W of Cobb, California M4.7 128 km 4 km
May 21, 1996 8 km ESE of East Foothills, California M4.7 90 km 8 km
Apr 18, 1990 4 km N of Aromas, California M4.7 137 km 4 km
Aug 11, 1993 14 km ESE of Alum Rock, California M4.7 95 km 9 km
Jan 2, 2025 4 km NW of Cobb, CA M4.7 126 km 1 km
Aug 18, 1999 0 km S of Bolinas, California M4.6 99 km 8 km
Mar 24, 1991 1 km NNE of Interlaken, California M4.6 133 km 15 km
Jan 11, 2000 6 km N of Geyserville, California M4.6 133 km 6 km
Feb 18, 2004 4 km WNW of Cobb, California M4.6 126 km 3 km
Sep 19, 2023 15 km SW of Westley, CA M4.5 85 km 4 km
Jan 12, 2014 8 km W of Cobb, California M4.5 128 km 2 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

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

Date Rating Distance Path Fatalities
May 5, 1998 EF2 96 km 0.6 mi 0
Feb 7, 1978 EF2 61 km 1.9 mi 0
Apr 27, 1953 EF2 78 km 0.1 mi 0
Jan 11, 1951 EF2 99 km 5.7 mi 0
Mar 11, 2023 EF1 98 km 0.8 mi 0
Jan 10, 2023 EF1 75 km 0.4 mi 0
Dec 24, 2015 EF1 74 km 6.2 mi 0
Nov 15, 2015 EF1 99 km 3.0 mi 0
Jan 23, 2010 EF1 31 km 1.6 mi 0
Apr 14, 2006 EF1 78 km 0.5 mi 0
Mar 20, 2005 EF1 91 km 3.0 mi 0
May 5, 1998 EF1 98 km 0.3 mi 0
Dec 12, 1996 EF1 79 km 0.6 mi 0
Apr 19, 1988 EF1 40 km 0.2 mi 0
Apr 19, 1988 EF1 69 km 1.0 mi 0
Mar 22, 1983 EF1 66 km 2.0 mi 0
Jan 14, 1980 EF1 80 km 0.3 mi 0
Mar 4, 1978 EF1 90 km 2.5 mi 0
Mar 1, 1978 EF1 81 km 1.5 mi 0
May 31, 1967 EF1 34 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 67 km
1989 N. CALIFORNIA Earthquake 1.0 m 62 128 km
1856 N. CALIFORNIA Eruption + Earthquake 0.6 m — 96 km
1906 N. CALIFORNIA Eruption + Earthquake 0.1 m — 94 km
1865 N. CALIFORNIA Eruption + Earthquake — — 110 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (135 km).

Name Type Elevation Last Eruption Distance
Clear Lake Volcanic field 1,439 m (4,721 ft) Unknown 135 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 75 km
2020 HENNESSEY 314,241 78 km
2018 COUNTY 92,450 75 km
2015 BUTTE 72,894 89 km
2020 GLASS 68,020 93 km
2017 NUNS 56,883 81 km
2017 ATLAS 51,664 60 km
2004 RUMSEY 39,335 88 km
1999 SIXTEEN 37,162 95 km
2006 CANYON 36,851 92 km
1988 MILLER 35,750 52 km
1992 GULCH 18,019 99 km
2024 CORRAL 16,138 60 km
2006 ZAM ASSIST 14,404 71 km
2018 WAVERLY 12,238 69 km
2009 CORRAL 12,006 64 km
1996 SCOTT 8,828 66 km
2015 WRAGG 8,455 54 km
2003 BIRD 7,727 72 km
2014 MONTICELLO 6,984 58 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 48°F (9°C) 3.1 in Wettest
February 51°F (10°C) 2.6 in
March 55°F (13°C) 2.1 in
April 59°F (15°C) 0.8 in
May 65°F (18°C) 0.4 in
June 70°F (21°C) 0.1 in
July 77°F (25°C) 0.0 in Warmest, Driest
August 71°F (22°C) 0.1 in
September 69°F (20°C) 0.2 in
October 63°F (17°C) 0.9 in
November 53°F (12°C) 2.1 in
December 46°F (8°C) 2.1 in Coldest

Isleton has a seasonal temperature swing of 31°F / from 46°F in December to 77°F in July. Total annual precipitation is 14.4 inches, with January being the wettest month (3.1") and July the driest (0.0").

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