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Extreme Heat Watch Issued for Coastal San Diego and Orange Counties

August 23, 2026 · wweather1 editorial · 1 min read

The National Weather Service in San Diego has issued an Extreme Heat Watch for coastal areas in San Diego and Orange counties, in effect from Tuesday morning through Friday evening.

Temperatures are forecasted to range from 85 to 90 degrees across the Orange County Coastal Areas and San Diego County Coastal Areas. The watch begins on the morning of Tuesday, August 25, and continues until 8:00 PM PDT on Friday, August 28.

Overnight low temperatures are expected to remain approximately 5 to 7 degrees above normal. These high overnight temperatures will limit relief from the heat, particularly for individuals without adequate cooling.

The National Weather Service cautions that heat-related illnesses increase significantly during extreme heat events. The watch notice was originally issued on August 22 at 9:43 PM PDT.

Why it is dangerous and what to do

⚠️ Safety
• Drink plenty of fluids.
• Stay in an air-conditioned room.
• Stay out of the sun.
• Check up on relatives and neighbors.
📊 The numbers, from wweather1 data
San Diego: now +34°, Clear.
That is 12° above the September climate norm.
The record for this date is +36° (1944).
Three-day forecast: 8 September: +37°/+24° · 9 September: +32°/+23° · 10 September: +26°/+22°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.

🌍 Weather in nearby cities

📰 Data source: NWS. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

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