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Weather & Climate in San Martin, CA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Martin enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 49°F in January while summers reach 71°F in July. The area gets 330 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 19.8 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 283 feet.
Temperature
49°F Jan (10°C)
71°F Jul (21°C)
| Annual Average | 60.2°F |
| 11% above US avg | |
| January Average | 49°F (10°C) |
| July Average | 71°F (21°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 283 ft (86 m) |
| Area | 11.6 sq mi (30.0 km²) |
| Population Density | 621/sq mi |
| Coordinates | 37.0829°N, 121.5963°W |
| Timezone | America/Los_Angeles |
| County | Santa Clara County County |
| Nearest Airport | Norman Y Mineta San Jose International (SJC) 27 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very High |
| Risk Score | 99.8 / 100 |
| Social Vulnerability | 17.2 / 100 |
| Community Resilience | 72.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very High |
| Wildfire | Relatively Moderate |
| Flood | Very High |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively High |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| 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
4,504 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 | 141 km | 11 km |
| Apr 18, 1990 | 5 km NNW of Aromas, California | M5.4 | 18 km | 5 km |
| Oct 21, 2012 | 24 km NE of San Lucas, California | M5.3 | 108 km | 9 km |
| Sep 17, 1991 | 22 km NW of San Simeon, California | M5.2 | 143 km | 9 km |
| Aug 12, 1998 | 10 km SW of Ridgemark, California | M5.1 | 38 km | 9 km |
| Apr 18, 1990 | 4 km E of Interlaken, California | M5.1 | 16 km | 7 km |
| Jan 16, 1993 | 9 km E of Gilroy, California | M4.9 | 14 km | 7 km |
| Apr 19, 1996 | 2 km E of Aromas, California | M4.9 | 22 km | 5 km |
| Apr 18, 1990 | 4 km NNW of Aromas, California | M4.9 | 18 km | 6 km |
| Apr 23, 1995 | 22 km NNE of Soledad, California | M4.9 | 64 km | 7 km |
| May 14, 2002 | 5 km SSW of Gilroy, California | M4.9 | 13 km | 7 km |
| May 21, 1996 | 8 km ESE of East Foothills, California | M4.7 | 33 km | 8 km |
| Feb 4, 1991 | 33 km SE of Big Sur, California | M4.7 | 117 km | 9 km |
| Apr 18, 1990 | 4 km N of Aromas, California | M4.7 | 18 km | 4 km |
| Aug 11, 1993 | 14 km ESE of Alum Rock, California | M4.7 | 27 km | 9 km |
| Aug 27, 2011 | 21 km NE of Soledad, California | M4.6 | 67 km | 8 km |
| Aug 18, 1999 | 0 km S of Bolinas, California | M4.6 | 133 km | 8 km |
| Mar 24, 1991 | 1 km NNE of Interlaken, California | M4.6 | 17 km | 15 km |
| Sep 19, 2023 | 15 km SW of Westley, CA | M4.5 | 48 km | 4 km |
| Jan 12, 2011 | 9 km SSE of San Juan Bautista, California | M4.5 | 36 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
60 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 11 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 5, 1998 | EF2 | 50 km | 0.6 mi | 0 |
| Mar 11, 1985 | EF2 | 31 km | 0.5 mi | 0 |
| Apr 27, 1953 | EF2 | 82 km | 0.1 mi | 0 |
| Jan 11, 1951 | EF2 | 56 km | 5.7 mi | 0 |
| Dec 14, 2024 | EF1 | 39 km | 0.3 mi | 0 |
| Nov 15, 2015 | EF1 | 85 km | 3.0 mi | 0 |
| Jan 23, 2010 | EF1 | 94 km | 1.6 mi | 0 |
| Apr 14, 2006 | EF1 | 82 km | 0.5 mi | 0 |
| Mar 20, 2005 | EF1 | 96 km | 3.0 mi | 0 |
| Dec 16, 2002 | EF1 | 99 km | 1.3 mi | 0 |
| Dec 20, 2001 | EF1 | 21 km | 0.5 mi | 0 |
| May 5, 1998 | EF1 | 57 km | 0.3 mi | 0 |
| Dec 6, 1992 | EF1 | 66 km | 7.0 mi | 0 |
| Dec 6, 1992 | EF1 | 59 km | 1.0 mi | 0 |
| Jan 14, 1980 | EF1 | 51 km | 0.3 mi | 0 |
| Mar 4, 1978 | EF1 | 76 km | 1.0 mi | 0 |
| Mar 4, 1978 | EF1 | 91 km | 2.5 mi | 0 |
| Mar 1, 1978 | EF1 | 88 km | 1.5 mi | 0 |
| Apr 22, 1967 | EF1 | 93 km | 0.1 mi | 0 |
| Apr 22, 1967 | EF1 | 75 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 | 82 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 26 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 78 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 105 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 30 km |
Source: NOAA/NCEI Historical Tsunami Database.
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 | 46 km |
| 2008 | BASIN COMPLEX | 164,537 | 97 km |
| 2016 | SOBERANES | 131,921 | 85 km |
| 2020 | CZU AUG LIGHTNING | 85,894 | 55 km |
| 2020 | RIVER | 51,582 | 66 km |
| 2007 | LICK | 47,424 | 22 km |
| 2006 | CANYON | 36,851 | 38 km |
| 1999 | KIRK COMPLEX (FIVE) | 36,162 | 89 km |
| 2003 | ANNIE | 17,383 | 35 km |
| 1996 | MERCY | 16,993 | 73 km |
| 2024 | CORRAL | 16,138 | 63 km |
| 1984 | BONANZA | 12,105 | 69 km |
| 2009 | CORRAL | 12,006 | 58 km |
| 1985 | LEXINGTON | 11,550 | 29 km |
| 2009 | LOCKHEED | 8,287 | 55 km |
| 2003 | BIRD | 7,727 | 57 km |
| 1985 | PONOCHE 2 | 7,508 | 84 km |
| 2020 | CARMEL | 7,299 | 74 km |
| 1984 | SITE 300 3 | 6,911 | 64 km |
| 2009 | GLORIA | 6,686 | 74 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 49°F (10°C) | 4.3 in | Wettest |
| February | 51°F (11°C) | 3.4 in | |
| March | 53°F (12°C) | 3.3 in | |
| April | 57°F (14°C) | 1.6 in | |
| May | 61°F (16°C) | 0.3 in | |
| June | 66°F (19°C) | 0.1 in | |
| July | 71°F (21°C) | 0.1 in | Driest |
| August | 71°F (22°C) | 0.1 in | Warmest |
| September | 69°F (20°C) | 0.3 in | |
| October | 64°F (18°C) | 1.0 in | |
| November | 55°F (13°C) | 3.1 in | |
| December | 48°F (9°C) | 3.3 in | Coldest |
San Martin has a seasonal temperature swing of 23°F / from 48°F in December to 71°F in August. Total annual precipitation is 20.7 inches, with January being the wettest month (4.3") and July the driest (0.1").