CALWIRE Weather Roundup (Sunday, October 4, 2026)
By Calwire Weather Desk
17 active weather alerts statewide today, led by a extreme heat warning for Death Valley National Park, plus coverage for Santa Ana Mountains and Foothills, San Diego County Inland Valleys.
Related: CALWIRE Stock Market Open Roundup (Sunday, October 4, 2026) · CALWIRE Weather Roundup (Sunday, July 19, 2026)
EXTREME HEAT WARNING — Death Valley National Park
Extreme Heat Warning issued October 4 at 12:19AM PDT until October 9 at 8:00PM PDT by NWS Las Vegas NV
EXTREME HEAT WARNING — Santa Ana Mountains and Foothills
Extreme Heat Warning issued October 4 at 4:28AM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
EXTREME HEAT WARNING — San Diego County Inland Valleys
Extreme Heat Warning issued October 4 at 4:28AM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
EXTREME HEAT WARNING — Orange County Inland
Extreme Heat Warning issued October 4 at 4:28AM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
EXTREME HEAT WARNING — San Diego County Coastal Areas
Extreme Heat Warning issued October 4 at 4:28AM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
EXTREME HEAT WARNING — Orange County Coastal
Extreme Heat Warning issued October 4 at 4:28AM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
EXTREME HEAT WARNING — San Bernardino and Riverside County Valleys-The Inland Empire
Extreme Heat Warning issued October 4 at 4:28AM PDT until October 8 at 8:00PM PDT by NWS San Diego CA
HEAT ADVISORY — Southwestern Interior Mendocino
Heat Advisory issued October 4 at 3:02AM PDT until October 4 at 11:00PM PDT by NWS Eureka CA
HEAT ADVISORY — West Side Mountains north of 198
Heat Advisory issued October 4 at 2:31AM PDT until October 7 at 11:00PM PDT by NWS Hanford CA
AIR QUALITY ALERT — Interstate 5 Corridor
Air Quality Alert issued October 3 at 8:35PM PDT by NWS Los Angeles/Oxnard CA
HEAT ADVISORY — Sonoma Coastal Range
Heat Advisory issued October 3 at 7:48PM PDT until October 7 at 10:00PM PDT by NWS San Francisco CA
HEAT ADVISORY — San Francisco
Heat Advisory issued October 3 at 7:48PM PDT until October 4 at 10:00PM PDT by NWS San Francisco CA
HEAT ADVISORY — Coastal North Bay Including Point Reyes National Seashore
Heat Advisory issued October 3 at 7:48PM PDT until October 4 at 10:00PM PDT by NWS San Francisco CA
HEAT ADVISORY — Western Shasta County Foothills Between 1000-3000 ft
Heat Advisory issued October 3 at 2:14PM PDT until October 7 at 10:00PM PDT by NWS Sacramento CA
HEAT ADVISORY — San Luis Obispo County Inland Central Coast
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