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Weather & Climate in Milpitas, CA

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

Milpitas enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 50°F in January while summers reach 68°F in July / relatively mild seasonal variation. 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 31.9 inches. The area receives 1.5 inches of snow annually. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 39 feet.

Temperature

50°F Jan (10°C) 68°F Jul (20°C)
Annual Average58.7°F
9% above US avg
January Average50°F (10°C)
July Average68°F (20°C)
Sunny Days326 days/yr

Geography

Elevation39 ft (12 m)
Area13.6 sq mi (35.3 km²)
Population Density5,802/sq mi
Coordinates37.4331°N, 121.8909°W
TimezoneAmerica/Los_Angeles
CountyAlameda County County
Nearest AirportNorman Y Mineta San Jose International (SJC)
5 miles away

Precipitation & Snow

Annual Rainfall 31.9"
16% below US avg
Snowfall 1.5"
Wettest Month (Jan) 3.19"
Driest Month (Jul) 0.04"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskVery High
Risk Score99.8 / 100
Social Vulnerability27.5 / 100
Community Resilience91.2 / 100

Hazard Breakdown

Tornado Relatively Moderate
Earthquake Very High
Wildfire Relatively High
Flood Very High
Hail Relatively Low
Strong Wind Very Low
Heat Wave Relatively High
Winter Weather Very Low
Lightning Relatively Low
Drought Relatively Moderate
Cold Wave No Rating
Landslide Relatively High
Coastal Flood Relatively High
Tsunami Relatively Low
Volcano Very Low
Avalanche Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

4,143 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 95 km 11 km
Apr 18, 1990 5 km NNW of Aromas, California M5.4 59 km 5 km
Aug 12, 1998 10 km SW of Ridgemark, California M5.1 85 km 9 km
Apr 18, 1990 4 km E of Interlaken, California M5.1 56 km 7 km
Jan 16, 1993 9 km E of Gilroy, California M4.9 60 km 7 km
May 14, 2002 5 km SSW of Gilroy, California M4.9 58 km 7 km
Apr 18, 1990 4 km NNW of Aromas, California M4.9 60 km 6 km
Apr 23, 1995 22 km NNE of Soledad, California M4.9 111 km 7 km
Sep 3, 2000 5 km WSW of Yountville, California M4.9 115 km 9 km
Apr 19, 1996 2 km E of Aromas, California M4.9 66 km 5 km
May 21, 1996 8 km ESE of East Foothills, California M4.7 17 km 8 km
Apr 18, 1990 4 km N of Aromas, California M4.7 60 km 4 km
Aug 11, 1993 14 km ESE of Alum Rock, California M4.7 23 km 9 km
Aug 27, 2011 21 km NE of Soledad, California M4.6 114 km 8 km
Mar 24, 1991 1 km NNE of Interlaken, California M4.6 54 km 15 km
Aug 18, 1999 0 km S of Bolinas, California M4.6 88 km 8 km
Sep 19, 2023 15 km SW of Westley, CA M4.5 53 km 4 km
Jan 12, 2011 9 km SSE of San Juan Bautista, California M4.5 82 km 8 km
Aug 3, 2006 5 km W of Glen Ellen, California M4.5 120 km 9 km
Jan 20, 2015 27 km ENE of Greenfield, California M4.4 138 km 9 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

64 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 12 injuries.

Date Rating Distance Path Fatalities
May 5, 1998 EF2 14 km 0.6 mi 0
Mar 11, 1985 EF2 78 km 0.5 mi 0
Apr 27, 1953 EF2 82 km 0.1 mi 0
Jan 11, 1951 EF2 21 km 5.7 mi 0
Dec 14, 2024 EF1 45 km 0.3 mi 0
Nov 15, 2015 EF1 96 km 3.0 mi 0
Jan 23, 2010 EF1 55 km 1.6 mi 0
Apr 14, 2006 EF1 82 km 0.5 mi 0
Mar 20, 2005 EF1 53 km 3.0 mi 0
Dec 20, 2001 EF1 52 km 0.5 mi 0
May 5, 1998 EF1 21 km 0.3 mi 0
Dec 12, 1996 EF1 99 km 0.6 mi 0
Dec 6, 1992 EF1 93 km 1.0 mi 0
Dec 6, 1992 EF1 98 km 7.0 mi 0
Jan 14, 1980 EF1 5 km 0.3 mi 0
Mar 4, 1978 EF1 96 km 2.5 mi 0
Mar 4, 1978 EF1 92 km 1.0 mi 0
Mar 1, 1978 EF1 89 km 1.5 mi 0
May 31, 1967 EF1 79 km 0.1 mi 0
Apr 1, 1965 EF1 51 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 35 km
1989 N. CALIFORNIA Earthquake 1.0 m 62 44 km
1856 N. CALIFORNIA Eruption + Earthquake 0.6 m — 37 km
1906 N. CALIFORNIA Eruption + Earthquake 0.1 m — 61 km
1865 N. CALIFORNIA Eruption + Earthquake — — 26 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (187 km).

Name Type Elevation Last Eruption Distance
Clear Lake Volcanic field 1,439 m (4,721 ft) Unknown 187 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 35 km
2020 CZU AUG LIGHTNING 85,894 43 km
2007 LICK 47,424 47 km
2006 CANYON 36,851 49 km
2003 ANNIE 17,383 61 km
2024 CORRAL 16,138 44 km
2009 CORRAL 12,006 40 km
1985 LEXINGTON 11,550 32 km
2009 LOCKHEED 8,287 48 km
2003 BIRD 7,727 51 km
1984 SITE 300 3 6,911 44 km
2005 TESLA 6,638 38 km
2003 DEL PUERTO 6,441 43 km
2006 MIDWAY 6,243 42 km
2020 CREWS 5,802 60 km
2003 DEVIL 4,975 29 km
2003 JUMP 4,817 33 km
2016 LOMA 4,380 36 km
2008 WILD 4,100 100 km
2008 SUMMIT 3,642 44 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 50°F (10°C) 3.2 in Coldest, Wettest
February 53°F (12°C) 2.6 in
March 55°F (13°C) 2.5 in
April 58°F (15°C) 1.2 in
May 63°F (17°C) 0.2 in
June 67°F (20°C) 0.1 in
July 68°F (20°C) 0.0 in Driest
August 70°F (21°C) 0.1 in Warmest
September 69°F (20°C) 0.2 in
October 64°F (18°C) 0.9 in
November 56°F (13°C) 2.4 in
December 50°F (10°C) 2.3 in

Milpitas has a seasonal temperature swing of 20°F / from 50°F in January to 70°F in August. Total annual precipitation is 15.9 inches, with January being the wettest month (3.2") and July the driest (0.0").

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