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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Mostly Cloudy

99°F

37°C

Humidity 29%
Wind Speed NE 8 mph
Barometer 30.02 in
Dewpoint 61°F (16°C)
Visibility 9.00 mi
Heat Index100°F (38°C)
Last update 28 Aug 3:50 pm CDT
Extended Forecast for

Denison TX

  • Tonight

    Tonight: Clear, with a low around 74. East wind around 5 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 101. Southeast wind around 5 mph.

    High: 101 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 78. Southeast wind around 5 mph.

    Low: 78 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 101. Heat index values as high as 104. South wind 5 to 10 mph.

    High: 101 °F

    Hot

  • Sunday Night

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

    Low: 79 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 100. South wind 5 to 10 mph.

    High: 100 °F

    Hot

  • Monday Night

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

    Low: 79 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. South wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 78. South southeast wind 5 to 10 mph.

    Low: 78 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 74. East wind around 5 mph, with gusts as high as 20 mph.
Saturday
Sunny and hot, with a high near 101. Southeast wind around 5 mph.
Saturday Night
Mostly clear, with a low around 78. Southeast wind around 5 mph.
Sunday
Sunny and hot, with a high near 101. Heat index values as high as 104. South wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 79. South wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 100. South wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 79. South southeast wind 5 to 10 mph.
Tuesday
Sunny and hot, with a high near 99. South wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 78. South southeast wind 5 to 10 mph.
Wednesday
Sunny and hot, with a high near 100.
Wednesday Night
Mostly clear, with a low around 78.
Thursday
Sunny and hot, with a high near 101.
Thursday Night
Mostly clear, with a low around 79.
Friday
Sunny and hot, with a high near 101.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Denison TX
 33.75°N 96.57°W (Elev. 748 ft)
Last Update:
3:26 pm CDT Aug 28, 2026
Forecast Valid:
4pm CDT Aug 28, 2026-6pm CDT Sep 4, 2026
 
Forecast Discussion
 
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Additional Resources

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