UPDATE: Extreme heat watch affecting Southern California Thursday and Friday
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An updated extreme heat watch was issued by the NWS San Diego CA on Monday at 2:43 a.m. valid from Thursday 10 a.m. until Friday 8 p.m. The watch is for San Bernardino County Mountains, Riverside County Mountains and San Diego County Mountains.
The NWS describes, "High temperatures in the lower to mid 90s below 4500 feet and in the 80s from 4500 to 6500 feet possible."
"Heat related illnesses increase significantly during extreme heat events," says the NWS.
This watch is in effect until Friday at 8 p.m.
Tips from the NWS for staying safe during a heat wave
- Consume plenty of fluids to stay hydrated.
- Find cool shelter: Stay in an air-conditioned room.
- 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.
- Take extra precautions outdoors: If you work or spend time outside, be sure to take additional safety measures.
- Time your activities wisely: When possible, reschedule strenuous activities to early morning or evening.
- Recognize early indicators: Learn to identify the warning signs of heat exhaustion and heat stroke.
- Stay cool with clothing: Select lightweight and loose-fitting outfits for enhanced comfort.
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 15, 2026 at 1:40 AM.