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NWS Jacksonville Issues Extreme Heat Warning for Portions of Florida and Georgia

August 17, 2026 · wweather1 editorial · 1 min read

The National Weather Service in Jacksonville, Florida, has issued an Extreme Heat Warning for parts of northeast and northern Florida as well as southeast Georgia, effective until August 18 at 8:00 PM EDT.

Dangerously hot conditions are expected, with heat index values ranging from 110 to 115. Additionally, a Heat Advisory is in effect with heat index values between 108 and 112.

The warning covers numerous areas including Suwannee, Baker, Inland Nassau, Union, Bradford, Gilchrist, Inland Flagler, Eastern Hamilton, Coastal Nassau, Coastal Duval, Eastern Clay, Eastern Alachua, Eastern Putnam, Coastal Flagler, Eastern Marion, Western Hamilton, Trout River, Western Clay, Northeast Coastal St. Johns, Western Alachua, and Western portions.

Impacts from these high temperatures and high humidity include a significant increase in heat-related illnesses. Hot temperatures and high humidity may cause heat illnesses during the event.

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 wear lightweight and loose-fitting clothing.
• Limit strenuous activities to the early morning or evening.
• Check up on relatives and neighbors, and take action when observing symptoms of heat exhaustion and heat stroke.
📊 The numbers, from wweather1 data
Jacksonville: now +35°, Mostly clear.
That is 5° above the August climate norm.
The record for this date is +37° (1954).
Three-day forecast: 17 August: +36°/+26° · 18 August: +38°/+25° · 19 August: +40°/+27°
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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