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Weather & Climate in El Sobrante CDP (Riverside County), CA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
El Sobrante CDP (Riverside County) enjoys a temperate climate with an average annual temperature of 66°F (19°C). Winters average 56°F in January while summers reach 79°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 9.4 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 1,238 feet.
Temperature
56°F Jan (13°C)
79°F Jul (26°C)
| Annual Average | 66.2°F |
| 23% above US avg | |
| January Average | 56°F (13°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 1,238 ft (377 m) |
| Area | 7.2 sq mi (18.7 km²) |
| Population Density | 1,827/sq mi |
| Coordinates | 33.8725°N, 117.4625°W |
| Timezone | America/Los_Angeles |
| County | Orange County County |
| Nearest Airport | Ontario International (ONT) 15 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 | 24.9 / 100 |
| Community Resilience | 16.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | No Rating |
| Earthquake | Very High |
| Wildfire | Relatively High |
| Flood | Very High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively High |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively High |
| Tsunami | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
13,528 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.3.
| Jun 28, 1992 | The 1992 Landers, California Earthquake | M7.3 | 101 km | 0 km |
| Oct 16, 1999 | The 1999 Hector Mine, California Earthquake | M7.1 | 137 km | 14 km |
| Jan 17, 1994 | Northridge, California, earthquake | M6.7 | 106 km | 18 km |
| Jun 28, 1992 | The 1992 Big Bear, California Earthquake | M6.3 | 69 km | 4 km |
| Apr 23, 1992 | The 1992 Joshua Tree, California Earthquake | M6.1 | 106 km | 12 km |
| Jan 17, 1994 | 1km ENE of Granada Hills, California | M5.9 | 105 km | 5 km |
| Jun 28, 1991 | The 1991 Sierra Madre, California Earthquake | M5.8 | 66 km | 8 km |
| Jun 28, 1992 | 3km NE of Yucca Valley, California | M5.8 | 101 km | -1 km |
| Oct 16, 1999 | 13km WSW of Ludlow, CA | M5.8 | 140 km | 14 km |
| Jun 28, 1992 | 2km SSW of Joshua Tree, California | M5.7 | 109 km | 6 km |
| Jun 29, 1992 | 3km ESE of Yucca Valley, California | M5.7 | 101 km | 10 km |
| Oct 16, 1999 | 7km ENE of Running Springs, CA | M5.6 | 56 km | 6 km |
| Jan 17, 1994 | 7km NNE of Simi Valley, California | M5.6 | 124 km | 9 km |
| Jun 28, 1992 | 11km SSE of Big Bear Lake, California | M5.5 | 65 km | 10 km |
| Feb 28, 1990 | The 1990 Upland, California Earthquake | M5.5 | 37 km | 3 km |
| Jun 28, 1992 | 0km E of Yucca Valley, CA | M5.5 | 99 km | 8 km |
| Jul 5, 1992 | 21km SW of Ludlow, California | M5.4 | 131 km | 5 km |
| Jul 7, 2010 | 20km NNW of Borrego Springs, CA | M5.4 | 105 km | 12 km |
| Jun 28, 1992 | 26km NNW of Yucca Valley, CA | M5.4 | 102 km | 4 km |
| Oct 16, 1999 | 32km SSW of Ludlow, California | M5.4 | 128 km | 1 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
127 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 58 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 22, 2008 | EF2 | 20 km | 2.8 mi | 0 |
| Mar 1, 1983 | EF2 | 85 km | 3.5 mi | 0 |
| Nov 9, 1982 | EF2 | 69 km | 10.0 mi | 0 |
| Nov 9, 1982 | EF2 | 97 km | 1.0 mi | 0 |
| Nov 7, 1966 | EF2 | 80 km | 10.3 mi | 0 |
| Nov 7, 1966 | EF2 | 77 km | 0.1 mi | 0 |
| Nov 7, 1966 | EF2 | 49 km | 0.2 mi | 0 |
| Jun 25, 1954 | EF2 | 88 km | 0.1 mi | 0 |
| Mar 22, 2023 | EF1 | 63 km | 0.5 mi | 0 |
| Jan 19, 2010 | EF1 | 64 km | 4.6 mi | 0 |
| Aug 4, 2008 | EF1 | 96 km | 1.1 mi | 0 |
| Feb 19, 2005 | EF1 | 51 km | 2.8 mi | 0 |
| Jan 29, 1998 | EF1 | 93 km | 0.5 mi | 0 |
| Jan 9, 1998 | EF1 | 66 km | 1.5 mi | 0 |
| Dec 21, 1997 | EF1 | 55 km | 1.0 mi | 0 |
| Nov 11, 1997 | EF1 | 39 km | 0.2 mi | 0 |
| May 18, 1997 | EF1 | 87 km | 3.5 mi | 0 |
| May 18, 1997 | EF1 | 85 km | 9.0 mi | 0 |
| May 11, 1997 | EF1 | 76 km | 0.2 mi | 0 |
| Dec 22, 1996 | EF1 | 63 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
4 tsunamis recorded within 500 km. Highest wave on record: 3.1 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1930 | S. CALIFORNIA | Eruption + Earthquake | 3.1 m | 1 | 110 km |
| 1862 | S. CALIFORNIA | Eruption + Earthquake | 1.2 m | — | 133 km |
| 1994 | WEST COAST, USA | Earthquake | 0.1 m | 57 | 106 km |
| 1855 | S. CALIFORNIA | Eruption + Earthquake | — | — | 64 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: Salton Buttes (187 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Salton Buttes | Lava dome(s) | -40 m (-131 ft) | 210 | 187 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: STATION (165,368 acres, 2009).
| Year | Name | Acres Burned | Distance |
| 2009 | STATION | 165,368 | 80 km |
| 2020 | BOBCAT | 115,728 | 67 km |
| 2003 | OLD | 90,180 | 45 km |
| 2006 | MILLARD | 86,585 | 82 km |
| 1999 | WILLOW | 63,525 | 62 km |
| 2003 | PARADISE | 55,995 | 90 km |
| 2003 | GRAND PRIX | 50,799 | 35 km |
| 2007 | POOMACHA | 47,496 | 81 km |
| 2016 | SAND | 41,561 | 100 km |
| 2006 | ESPERANZA | 40,566 | 54 km |
| 2002 | WILLIAMS | 37,505 | 46 km |
| 2016 | BLUE CUT | 36,856 | 50 km |
| 2008 | YELLOW | 33,232 | 53 km |
| 2020 | APPLE | 32,374 | 58 km |
| 2015 | LAKE | 30,421 | 71 km |
| 2008 | FREEWAY COMPLEX | 29,350 | 27 km |
| 2022 | FAIRVIEW | 28,680 | 59 km |
| 2013 | MOUNTAIN | 28,202 | 78 km |
| 2007 | SANTIAGO | 27,605 | 25 km |
| 1998 | EDNA | 27,561 | 43 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 56°F (13°C) | 2.8 in | |
| February | 56°F (13°C) | 2.9 in | Wettest |
| March | 57°F (14°C) | 2.6 in | |
| April | 61°F (16°C) | 0.8 in | |
| May | 65°F (19°C) | 0.3 in | |
| June | 71°F (22°C) | 0.1 in | |
| July | 79°F (26°C) | 0.0 in | Warmest, Driest |
| August | 78°F (25°C) | 0.2 in | |
| September | 74°F (23°C) | 0.4 in | |
| October | 68°F (20°C) | 0.4 in | |
| November | 59°F (15°C) | 1.4 in | |
| December | 54°F (12°C) | 1.9 in | Coldest |
El Sobrante CDP (Riverside County) has a seasonal temperature swing of 25°F / from 54°F in December to 79°F in July. Total annual precipitation is 13.6 inches, with February being the wettest month (2.9") and July the driest (0.0").