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

Severe Thunderstorms in the Central U.S.; Heavy to Excessive Rainfall in the Ohio Valley and Central Appalachians

Severe thunderstorms producing damaging winds, hail, and a few tornadoes are expected through Tuesday across parts of the central Plains and lower to mid Missouri Valley. Heavy to excessive rainfall could produce flooding across portions of the Ohio Valley into the Central Appalachians through Tuesday. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

90°F

32°C

Humidity 52%
Wind Speed Calm
Barometer 29.88 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 16 Jun 6:50 pm CDT
Extended Forecast for

Grayson County Airport TX

  • Tonight

    Tonight: Mostly clear, with a low around 75. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Heat index values as high as 105. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 75. South wind around 15 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 91. Heat index values as high as 98. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 91 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind 5 to 10 mph.

    Low: 73 °F

    Chance
    T-storms

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 91. South southwest wind around 5 mph.

    High: 91 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 75. South wind around 5 mph.

    Low: 75 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 94. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 94 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 75. South wind around 10 mph.

    Low: 75 °F

    Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 75. Calm wind becoming south southeast around 5 mph after midnight.
Tuesday
Sunny, with a high near 93. Heat index values as high as 105. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 75. South wind around 15 mph, with gusts as high as 25 mph.
Wednesday
Mostly sunny, with a high near 91. Heat index values as high as 98. South wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind 5 to 10 mph.
Juneteenth
Mostly sunny, with a high near 91. South southwest wind around 5 mph.
Thursday Night
Mostly clear, with a low around 75. South wind around 5 mph.
Friday
Sunny, with a high near 94. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 75. South wind around 10 mph.
Saturday
Sunny, with a high near 93.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 74.
Monday
Sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayson County Airport TX
 33.71°N 96.68°W (Elev. 751 ft)
Last Update:
4:55 pm CDT Jun 16, 2025
Forecast Valid:
8pm CDT Jun 16, 2025-6pm CDT Jun 23, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation