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Update: Extreme heat watch for 5 Freeway north of LA from Monday to Friday

March 15, 2026

5 Freeway north of LA was placed under an updated extreme heat watch by the National Weather Service on Saturday at 6:33 p.m. The watch is valid from Monday 8 p.m. until Friday March 20, at 8 p.m.

“Dangerously hot conditions with temperatures of 90 to 104 degrees are possible,” according to the NWS Los Angeles/Oxnard CA. “Warm overnight low temperatures will contribute to the heat risk, especially in the mountain and foothill locations.”

“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,” the NWS said.

The full list of affected locations includes:

5 Freeway corridor near Santa Clarita
Catalina/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
Los Angeles County Beaches
Palos Verdes Peninsula
Los Angeles County Inland Coast including Downtown Los Angeles
Western Santa Monica Mountains Recreational area
Eastern Santa Monica Mountains Recreational area
Calabasas/Agoura Hills
San Fernando Valley
Southeastern Ventura County Valleys
Santa Susana Mountains
Southern Ventura County Mountains
Western San Gabriel Mountains/Highway 14 Corridor
Eastern San Gabriel Mountains
San Gabriel Valley

Staying safe in high temperatures

Safety tips from the Environmental Health and Safety office at UC Irvine:

Drink water: Drinking plenty of water frequently is vital for those exposed to heat. An individual may produce as much as 2 to 3 gallons of sweat per day. To replenish that fluid you should drink 3 to 4 cups of water every hour.
Take breaks: Taking breaks in a cool shaded area and allowing time for recovery from the heat during the day are effective ways to avoid heat-related illness.
Avoid some beverages: Avoid or limit the use of alcohol and caffeine during periods of extreme heat. Both dehydrate the body.
Stop and rest: If you start to feel symptoms such as nausea, dizziness, weakness or unusual fatigue, rest in a cool shaded area. If symptoms persist or worsen seek immediate medical attention.
Clothing: Whenever possible, wear clothing that provides protection from the sun but allows airflow to the body. Protect your head and shade your eyes when outdoors.
Be prepared: When in the heat be sure to pay extra attention to those you’re with and be sure you know how to call for medical attention.

For information about cooling centers operated by Los Angeles, Orange, Riverside and San Bernardino counties, see https://ready.lacounty.gov/heat/, https://ocgov.com/cooling-centers, https://capriverside.org/cool-centers and DPH.

For more local weather alerts, visit our Weather Advisory page

Update: Extreme heat watch for 5 Freeway north of LA from Monday to Friday Orange County Register

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Update: Extreme heat watch for 5 Freeway north of LA from Monday to Friday

Staying safe in high temperatures

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