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Extreme Heat Warning Issued for Portions of North Texas

August 17, 2026 · wweather1 editorial · 2 min read

The National Weather Service in Fort Worth has issued an Extreme Heat Warning for portions of North Texas, effective from noon to 8:00 PM CDT on Tuesday, August 18. Dangerously hot conditions with temperatures reaching up to 108 degrees are expected.

Prior to the warning, a Heat Advisory remains in effect until noon CDT on Tuesday. Heat index values up to 106 degrees are anticipated during the advisory period, followed by extreme heat conditions reaching up to 108 degrees under the warning.

The affected region includes Montague, Cooke, Grayson, Fannin, Lamar, Young, Jack, Wise, Denton, Collin, Hunt, Delta, Hopkins, Stephens, Palo Pinto, Parker, Tarrant, Dallas, Rockwall, Kaufman, Van Zandt, Rains, Eastland, Erath, Hood, Somervell, Johnson, and Ellis counties.

Weather officials emphasize that high temperatures combined with humidity significantly elevate the risk of heat-related illnesses. The danger is particularly pronounced for individuals working or participating in outdoor activities.

Peak heat hours are expected between 2:00 PM and 7:00 PM. Authorities remind the public that heat stroke is a medical emergency requiring immediate assistance.

Why it is dangerous and what to do

⚠️ Safety
• Stay hydrated, wear lightweight and loose-fitting clothing, and limit strenuous outdoor activities to the early morning or evening.
• Never leave young children or pets in an enclosed vehicle, as interior temperatures can rapidly rise to life-threatening levels.
• Take frequent rest breaks in shaded or air-conditioned environments when outdoors, and move anyone overcome by heat to a cool location.
• Check on relatives and neighbors, and locate nearby cooling centers through local resources or by dialing 2-1-1 in Texas.
📊 The numbers, from wweather1 data
Dallas: now +41°, Clear.
That is 7° above the August climate norm.
The record for this date is +42° (2023).
Three-day forecast: 17 August: +41°/+26° · 18 August: +42°/+27° · 19 August: +42°/+31°
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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