UPDATE: Extreme heat watch in place for Southern California from Monday to Friday

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At 12:07 a.m. on Sunday, the NWS Los Angeles/Oxnard CA issued an updated extreme heat watch valid from Monday 8 p.m. until Friday 8 p.m. The watch is for Catalina and Santa Barbara Islands, Santa Clarita Valley, San Luis Obispo County Beaches, San Luis Obispo County Inland Central Coast, Santa Lucia Mountains, San Luis Obispo County Mountains, Santa Barbara County Central Coast Beaches, Santa Barbara County Inland Central Coast, Santa Ynez Valley, Santa Barbara County Southwestern Coast, Santa Barbara County Southeastern Coast, Santa Ynez Mountains Western Range, Santa Ynez Mountains Eastern Range, Santa Barbara County Interior Mountains, Ventura County Beaches, Ventura County Inland Coast, Lake Casitas, Ojai Valley, Central Ventura County Valleys, Malibu Coast, Los Angeles, Palos Verdes Hills, Western Santa Monica Mountains Recreational area, Eastern Santa Monica Mountains Recreational area, Calabasas and Agoura Hills, Western San Fernando Valley, Eastern San Fernando Valley, Southeastern Ventura County Valleys, Santa Susana Mountains, Southern Ventura County Mountains, Interstate 5 Corridor, Western San Gabriel Mountains and Highway 14 Corridor and Eastern San Gabriel Mountains.

The NWS says, "Dangerously hot conditions with temperatures of 90 to 104 degrees are possible."

"There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors. There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors," adds the NWS.

This watch is in effect until Friday at 8 p.m.

Protect yourself during a heat wave with these tips from the NWS

• Stay hydrated: Remember to drink plenty of fluids.
• Find cool shelter: Stay in an air-conditioned room.
• Look out for others: Stay out of the sun, and check up on relatives and neighbors.
• Child and pet safety: Do not leave young children and pets unattended in vehicles when car interiors can reach lethal temperatures in a matter of minutes.
• Be mindful outdoors: Take extra precautions when working or spending time outside.
• Find the right time: Consider rescheduling strenuous activities to early morning or evening if possible.
• Recognize warning signs: Know the signs and symptoms of heat exhaustion and heat stroke.
• Dress comfortably: Wear lightweight and loose-fitting clothing.

To reduce risk during outdoor work, the Occupational Safety and Health Administration (OSHA) recommends scheduling frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. In an emergency, call 911.

Source: The National Weather Service

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This story was originally published March 13, 2026 at 12:12 PM.