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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 expected to last until Thursday evening.

The National Weather Service in San Diego, California, issued the Extreme Heat Warning on October 4 at 4:28 AM Pacific Daylight Time. The warning remains in effect until October 8 at 8:00 PM Pacific Daylight Time.

During this event, dangerously hot conditions are expected. 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. Nights will also remain very warm, with low temperatures mostly in the 70s.

The National Weather Service notes that heat-related illnesses increase significantly during extreme heat events. Residents in the affected areas are advised to take precautions as these high temperatures persist.

Why it is dangerous and what to do

⚠️ Safety
• Drink plenty of fluids and stay in an air-conditioned room.
• Stay out of the sun and check up on relatives and neighbors.
• Do not leave young children and pets in unattended vehicles.
📊 The numbers, from wweather1 data
San Diego: now +30°, Clear.
That is 13° above the October climate norm.
The record for this date is +35° (1987).
Three-day forecast: 4 October: +36°/+25° · 5 October: +37°/+22° · 6 October: +32°/+21°
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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