Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

Severe thunderstorms will be possible across the northern/central Plains through Tuesday afternoon and from the central Plains to the Mid-Mississippi Valley Tuesday evening through Wednesday morning. Storms may produce large hail and damaging wind gusts, and heavy rainfall may lead to scattered instances of flash flooding. Meanwhile, hazardous heat persists across the South and Southeast. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

92°F

33°C

Humidity 35%
Wind Speed S 9 mph
Barometer 30.00 in
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 17 Aug 10:55 pm CDT
Extended Forecast for

5 Miles W Grayson County Airport TX

Heat Advisory August 17, 11:14pm until August 18, 12:00pm
Extreme Heat Warning August 18, 12:00pm until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
Extreme Heat Warning
  •  
    Heat Advisory August 17, 11:14pm until August 18, 12:00pm

    NOW until 12:00pm Tue

    Heat Advisory

  • Tonight

    Low: 79 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 106. South wind 5 to 10 mph becoming west in the morning.

    High: 106 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 81. South wind 5 to 10 mph.

    Low: 81 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 105. Southwest wind 5 to 10 mph.

    High: 105 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 81. South wind 5 to 10 mph.

    Low: 81 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 104. Southwest wind 5 to 10 mph.

    High: 104 °F

    Hot

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 78. South southeast wind around 5 mph.

    Low: 78 °F

    Partly Cloudy

  • Friday

    Friday: Sunny and hot, with a high near 102. South southeast wind around 5 mph becoming northwest in the morning.

    High: 102 °F

    Hot

Detailed Forecast

Tonight
Mostly clear, with a low around 79. East southeast wind around 5 mph.
Tuesday
Sunny and hot, with a high near 106. South wind 5 to 10 mph becoming west in the morning.
Tuesday Night
Mostly clear, with a low around 81. South wind 5 to 10 mph.
Wednesday
Sunny and hot, with a high near 105. Southwest wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 81. South wind 5 to 10 mph.
Thursday
Sunny and hot, with a high near 104. Southwest wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 78. South southeast wind around 5 mph.
Friday
Sunny and hot, with a high near 102. South southeast wind around 5 mph becoming northwest in the morning.
Friday Night
Mostly clear, with a low around 77. East northeast wind around 5 mph becoming south after midnight.
Saturday
Sunny and hot, with a high near 102.
Saturday Night
Mostly clear, with a low around 77.
Sunday
Sunny and hot, with a high near 102.
Sunday Night
Mostly clear, with a low around 79.
Monday
Sunny and hot, with a high near 103.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles W Grayson County Airport TX
 33.73°N 96.76°W (Elev. 646 ft)
6:12 pm CDT Aug 17, 2026
11pm CDT Aug 17, 2026-6pm CDT Aug 24, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database