Overview
- A strong high-pressure ridge has produced the peak of a regional heat wave in San Diego County with the highest temperatures this weekend.
- The National Weather Service has issued Extreme Heat Warnings for inland valleys and mountains through Sunday evening and extended warnings in the deserts through Monday evening, plus a Heat Advisory for coastal zones through Sunday night.
- Forecast highs span the county with upper 70s to low 90s on the coast, around 90–103°F in inland valleys, 93–104°F in the mountains, and as hot as 116–119°F in desert areas.
- Officials warn of moderate-to-high heat risk and urge hydration, avoiding daytime exertion, never leaving children or pets in vehicles, and using cooling centers if needed; lifeguards also caution about strong rip currents and large surf.
- The ridge should weaken beginning Sunday to yield slight cooling along the coast and valleys, but rising monsoon moisture will keep humidity higher and leave mountains and deserts warmer than average into next week.