A prolonged early-October heat wave is keeping much of Southern California under Extreme Heat Warnings through Thursday evening, October 8, with inland temperatures reaching the low 100s and warm nights limiting relief.
The National Weather Service office in Los Angeles/Oxnard said Sunday morning that warnings covered the Los Angeles and Ventura County coasts and valleys, the Santa Barbara County south coast and mountains, and nearby areas. Forecast highs ranged from around 90°F at some beaches to about 105°F in the hottest valleys. Other parts of the region were under Heat Advisories.
Where the warnings apply
An official warning issued Saturday remained valid until 8 p.m. PDT Thursday for Los Angeles and Ventura County coastal and valley zones. The San Diego office separately warned that inland Orange County could reach the mid-90s to 105°F, the Inland Empire and inland San Diego valleys could reach the upper 90s to about 103°F, and even parts of the immediate coast could be unusually hot.
Farther north, the Bay Area and Central Coast were under a Heat Advisory through Sunday night, with an interior advisory then scheduled from late Sunday through Wednesday. Death Valley National Park was under an Extreme Heat Warning from Sunday morning through Friday evening, with highs near 110°F and overnight lows near 85°F.
Why overnight heat matters
The risk is not limited to afternoon readings. Overnight temperatures in some urban and foothill locations may stay in the 70s, reducing the body’s opportunity to recover. People without effective cooling, outdoor workers, older adults, young children and people with chronic illness face the greatest danger.
Forecasters urged residents to drink water, move strenuous activity to cooler hours, check on neighbors, and never leave children or pets in parked vehicles. Anyone who develops confusion, loss of consciousness or very hot skin may be experiencing heat stroke and needs emergency care.
The warnings describe a forecast hazard, not a guarantee that every location will reach the listed maximum. Local marine influence, elevation and cloud cover can produce sharp differences. Readers should check their exact location on the NWS Los Angeles/Oxnard page or the appropriate local office before making plans.
For other active hazards and forecast changes, visit the AskNovus Weather section.
Sources
- National Weather Service Los Angeles/Oxnard, updated October 4, 2026.
- NWS Extreme Heat Warning text, issued October 3 and updated October 4, 2026.
- National Weather Service Bay Area, updated October 4, 2026.
Featured-image credit: Alejandro Ortega Grillo/Unsplash. The image is illustrative.