California weather by county

California in September 2026

• 4 of 58 counties ran at least 1° warmer than usual in September 2026, and 40 ran at least 1° cooler.
• Warmest against its own records: Orange County (12th-warmest September of 132). Coolest: Del Norte County (22nd-coldest).
• Wettest September against its records: Orange County, 0.8 inches (11th-wettest).
• 41 of 58 counties were in moderate drought or worse on NOAA's Palmer reading for September.
• Since 1970 the state's counties have warmed about 0.5° per decade on average, Amador County the most at 0.6°.

This week's forecast against the usual, and every month since 1895, for all 58 counties in California. None had a top-10 warm September in 2026.

• Alameda County 55th warmest Sep
• Alpine County 60th warmest Sep
• Amador County 77th warmest Sep
• Butte County 82nd warmest Sep
• Calaveras County 74th warmest Sep
• Colusa County 109th warmest Sep
• Contra Costa County 63rd warmest Sep
• Del Norte County 111th warmest Sep
• El Dorado County 66th warmest Sep
• Fresno County 60th warmest Sep
• Glenn County 111th warmest Sep
• Humboldt County 55th warmest Sep
• Imperial County 20th warmest Sep
• Inyo County 40th warmest Sep
• Kern County 63rd warmest Sep
• Kings County 53rd warmest Sep
• Lake County 107th warmest Sep
• Lassen County 78th warmest Sep
• Los Angeles County 28th warmest Sep
• Madera County 53rd warmest Sep
• Marin County 30th warmest Sep
• Mariposa County 63rd warmest Sep
• Mendocino County 97th warmest Sep
• Merced County 53rd warmest Sep
• Modoc County 81st warmest Sep
• Mono County 45th warmest Sep
• Monterey County 33rd warmest Sep
• Napa County 71st warmest Sep
• Nevada County 80th warmest Sep
• Orange County 12th warmest Sep
• Placer County 83rd warmest Sep
• Plumas County 76th warmest Sep
• Riverside County 23rd warmest Sep
• Sacramento County 85th warmest Sep
• San Benito County 51st warmest Sep
• San Bernardino County 32nd warmest Sep
• San Diego County 16th warmest Sep
• San Francisco County 25th warmest Sep
• San Joaquin County 59th warmest Sep
• San Luis Obispo County 44th warmest Sep
• San Mateo County 34th warmest Sep
• Santa Barbara County 13th warmest Sep
• Santa Clara County 47th warmest Sep
• Santa Cruz County 41st warmest Sep
• Shasta County 94th warmest Sep
• Sierra County 74th warmest Sep
• Siskiyou County 88th warmest Sep
• Solano County 62nd warmest Sep
• Sonoma County 77th warmest Sep
• Stanislaus County 53rd warmest Sep
• Sutter County 86th warmest Sep
• Tehama County 94th warmest Sep
• Trinity County 90th warmest Sep
• Tulare County 54th warmest Sep
• Tuolumne County 70th warmest Sep
• Ventura County 17th warmest Sep
• Yolo County 83rd warmest Sep
• Yuba County 79th warmest Sep

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