The National Weather Service issued a Severe Extreme Heat Warning in effect from 8 AM on September 9, 2026 until 8 PM on September 10, 2026 for multiple Southern California locations including CalabasasAgoura HillsEastern San Fernando Valley and Eastern Santa Monica Mountains Recreational Area and extending across Los Angeles County BeachesLos Angeles County Inland Coast including Downtown Los AngelesLos Angeles County San Gabriel Valley the Malibu Coast and adjacent hills.
The warning covered a broad temperature envelope, with forecast highs ranging between 92 and 108 degrees Fahrenheit, and aimed to alert residents that unusually hot conditions could increase the risk of heat-related illnesses. Last update: September 10, 2026. The advisory stressed precautions such as staying hydrated and remaining in air-conditioned spaces, and reiterated emergency guidance to dial 911 for heat emergencies.
Expanded area and timing
The advisory named specific areas across the metropolitan region and nearby ranges: Palos Verdes HillsWestern San Fernando Valley and the Western Santa Monica Mountains Recreational Area were included alongside inland and coastal sectors. The warning window ran through the evening of September 10, 2026 with the NWS emphasizing that both County Beaches and inland zones could experience the high-end temperatures between 92 and 108 degrees.
Additional impacts for Santa Barbara terrain
Officials also issued a related Severe Extreme Heat Warning for parts of Santa Barbara County covering the Southwestern Coast and the Santa Ynez Mountains Western Range through 8:00 PM PDT, where forecast highs spanned 88 to 108 degrees. Forecasters warned of Northwest Sundowner winds of 15-30 mph with gusts of 35-45 mph and localized gusts up to 50 mph near Gaviota and Refugio, noting that gusty conditions could cause unsecured objects to move and produce isolated power outages.
Health and safety guidance
The advisory described an Extreme Heat Warning as indicating conditions that may cause heat illnesses, especially among vulnerable populations. Residents were urged to check on relatives and neighbors, avoid leaving young children and pets in vehicles, and follow local cooling center information where available. The notice reiterated that hot car interiors can reach lethal temperatures quickly and reiterated emergency contact protocols.
