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Extreme heat warning for 5 Freeway north of LA until Friday evening – temperatures up to 104 degrees

March 20, 2026

5 Freeway north of LA is under an extreme heat warning which was released by the National Weather Service on Friday at 12:05 a.m. The warning is in effect until 8 p.m.

“Dangerously hot conditions with temperatures between 96 and 104 degrees expected,” 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,” the NWS said.

The full list of affected locations includes:

5 Freeway corridor near Santa Clarita
Santa Clarita Valley
Lake Casitas
Ojai Valley
Central Ventura County Valleys
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

Emergency alerts in Southern California

For “considerable or catastrophic” hazards, emergency alerts will be sent to all enabled mobile phones in the area. To monitor lesser risk, residents are advised to sign up for county alert systems and to monitor agencies’ social media. How to sign up for alerts in your area:

LA County

Orange County

Riverside County

San Bernardino County

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

Extreme heat warning for 5 Freeway north of LA until Friday evening – temperatures up to 104 degrees Orange County Register

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Extreme heat warning for 5 Freeway north of LA until Friday evening – temperatures up to 104 degrees

Emergency alerts in Southern California

Staying safe in high temperatures

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