National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Dangerous Heat and Severe Thunderstorms

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week before returning over much of the Plains into next week. Scattered strong to severe thunderstorms are possible across parts of the Northeast U.S. on Thursday. Damaging wind, hail, and a tornado or two are possible. Read More >

Hazardous Weather Conditions

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

83°F

28°C

Humidity 71%
Wind Speed Calm
Barometer 29.97 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 26 Aug 11:35 pm CDT
Extended Forecast for

Sherman TX

Heat Advisory August 26, 11:40pm until August 27, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 26, 11:40pm until August 27, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • Tonight

    Low: 76 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Sunny and hot, with a high near 99. Heat index values as high as 106. Northeast wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 75. Northeast wind 5 to 10 mph becoming light east northeast in the evening.

    Low: 75 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 97. Heat index values as high as 103. Calm wind becoming east around 5 mph in the morning.

    High: 97 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 76. Southeast wind around 5 mph.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 99. South wind around 5 mph.

    High: 99 °F

    Hot

  • Saturday Night

    Saturday Night: Clear, with a low around 77. South southeast wind around 5 mph.

    Low: 77 °F

    Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 99. South wind around 10 mph.

    High: 99 °F

    Hot

Detailed Forecast

Tonight
A 20 percent chance of showers before 1am. Mostly clear, with a low around 76. North wind around 5 mph becoming east after midnight.
Thursday
Sunny and hot, with a high near 99. Heat index values as high as 106. Northeast wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 75. Northeast wind 5 to 10 mph becoming light east northeast in the evening.
Friday
Sunny, with a high near 97. Heat index values as high as 103. Calm wind becoming east around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 76. Southeast wind around 5 mph.
Saturday
Sunny and hot, with a high near 99. South wind around 5 mph.
Saturday Night
Clear, with a low around 77. South southeast wind around 5 mph.
Sunday
Sunny and hot, with a high near 99. South wind around 10 mph.
Sunday Night
Clear, with a low around 77. South wind around 10 mph.
Monday
Sunny, with a high near 98.
Monday Night
Mostly clear, with a low around 78.
Tuesday
Sunny, with a high near 98.
Tuesday Night
Mostly clear, with a low around 78.
Wednesday
Sunny and hot, with a high near 100.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sherman TX
 33.64°N 96.6°W (Elev. 732 ft)
Last Update:
9:26 pm CDT Aug 26, 2026
Forecast Valid:
11pm CDT Aug 26, 2026-6pm CDT Sep 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation