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Extreme Heat Warning Issued for San Diego County Coastal Areas

October 4, 2026 · wweather1 editorial · 1 min read

An Extreme Heat Warning has been issued for the San Diego County Coastal Areas, bringing dangerously hot conditions through Thursday evening.

The National Weather Service in San Diego, California, issued the Extreme Heat Warning starting October 3 at 9:40 PM PDT, which remains in effect until October 8 at 8:00 PM PDT.

During this event, high temperatures will range from the mid 80s to mid 90s at the beaches, and from the mid 90s to the low 100s for the mesas. Nighttime temperatures will also remain very warm, with lows mostly in the 70s.

Impacts from the weather include a significant increase in heat-related illnesses during extreme heat events.

Why it is dangerous and what to do

⚠️ Safety
• Drink plenty of fluids.
• Stay in an air-conditioned room and stay out of the sun.
• Check up on relatives and neighbors.
• Do not leave young children and pets in unattended vehicles.
📊 The numbers, from wweather1 data
San Diego: now +25°, Clear.
That is 16° above the October climate norm.
The record for this date is +35° (1987).
Three-day forecast: 4 October: +39°/+24° · 5 October: +38°/+22° · 6 October: +32°/+26°
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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