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

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Mostly Cloudy

81°F

27°C

Humidity 84%
Wind Speed S 12 mph
Barometer 30.11 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 23 Jun 8:50 am CDT
Extended Forecast for

Denison TX

  • Today

    Today: A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 90. Heat index values as high as 102. South wind around 5 mph.

    High: 90 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 76. South southeast wind around 5 mph. Chance of precipitation is 40%.

    Low: 76 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 91. Heat index values as high as 101. South wind 5 to 10 mph.

    High: 91 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 92. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 92 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 77. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 93. South wind around 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 77. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 77 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 95. South wind around 15 mph, with gusts as high as 25 mph.

    High: 95 °F

    Mostly Sunny

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 90. Heat index values as high as 102. South wind around 5 mph.
Tonight
A slight chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 76. South southeast wind around 5 mph. Chance of precipitation is 40%.
Wednesday
Mostly sunny, with a high near 91. Heat index values as high as 101. South wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 92. South wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 77. South wind 10 to 15 mph, with gusts as high as 20 mph.
Friday
Mostly sunny, with a high near 93. South wind around 15 mph, with gusts as high as 25 mph.
Friday Night
Partly cloudy, with a low around 77. South wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday
Mostly sunny, with a high near 95. South wind around 15 mph, with gusts as high as 25 mph.
Saturday Night
Mostly clear, with a low around 77.
Sunday
Sunny, with a high near 96.
Sunday Night
Mostly clear, with a low around 79.
Monday
Sunny, with a high near 97.
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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:
6:06 am CDT Jun 23, 2026
Forecast Valid:
8am CDT Jun 23, 2026-6pm CDT Jun 29, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation