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

Heavy Rainfall and Flooding Threats in the Midwest and Ohio Valley; Heat Continues in the Plains and Southeast

An active pattern will continue to bring heavy to excessive rainfall and flash flooding threats to the Midwest and Ohio Valley over the next couple of days. Dangerous heat continues across the central/southern Plains and Southeast U.S. into next week. There is potential for record-tying/breaking temperatures with many areas forecast to see their hottest temperatures so far this year. Read More >

Hazardous Weather Conditions

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

91°F

33°C

Humidity 41%
Wind Speed SE 10 mph
Barometer 29.89 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 13 Aug 9:15 pm CDT
Extended Forecast for

Sherman TX

Heat Advisory August 13, 09:26pm until August 14, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 13, 09:26pm until August 14, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Tonight

    Low: 78 °F

    Clear

  • Friday

    Friday: Sunny and hot, with a high near 101. Heat index values as high as 104. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 101 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 79. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 79 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 100. Heat index values as high as 107. South wind around 10 mph.

    High: 100 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 79. South wind 5 to 10 mph.

    Low: 79 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 101. Southwest wind 5 to 10 mph.

    High: 101 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 78. South wind around 5 mph.

    Low: 78 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 102. Southwest wind 5 to 10 mph.

    High: 102 °F

    Hot

Detailed Forecast

Tonight
Clear, with a low around 78. South wind around 10 mph, with gusts as high as 20 mph.
Friday
Sunny and hot, with a high near 101. Heat index values as high as 104. South wind 10 to 15 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 79. South wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday
Sunny and hot, with a high near 100. Heat index values as high as 107. South wind around 10 mph.
Saturday Night
Mostly clear, with a low around 79. South wind 5 to 10 mph.
Sunday
Sunny and hot, with a high near 101. Southwest wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 78. South wind around 5 mph.
Monday
Sunny and hot, with a high near 102. Southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 78. South wind around 5 mph.
Tuesday
Sunny and hot, with a high near 102.
Tuesday Night
Mostly clear, with a low around 79.
Wednesday
Sunny and hot, with a high near 102.
Wednesday Night
Mostly clear, with a low around 79.
Thursday
Sunny and hot, with a high near 101.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sherman TX
 33.64°N 96.6°W (Elev. 732 ft)
Last Update:
6:12 pm CDT Aug 13, 2026
Forecast Valid:
9pm CDT Aug 13, 2026-6pm CDT Aug 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Link to Local Radar Data Link to Satellite Data

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