Dangerous Heat in the Central and Eastern U.S.; Severe Thunderstorms in the Central U.S. and Northeast; Critical Fire Weather in the Four Corners

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Severe thunderstorms are forecast across parts of the Upper Midwest into the Great Lakes, the Northeast, and the central High Plains. Critical fire weather conditions will continue across portions of the Four Corners and Great Basin. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

79°F

26°C

Humidity 84%
Wind Speed S 9 mph
Barometer 30.03 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 1 Jul 7:50 am CDT
Extended Forecast for

Grayson County Airport TX

  • Today

    Today: Sunny, with a high near 93. Heat index values as high as 98. South wind around 10 mph.

    High: 93 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 77. South wind around 10 mph.

    Low: 77 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 93. Heat index values as high as 100. South wind 5 to 10 mph.

    High: 93 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 77. South southeast wind around 10 mph.

    Low: 77 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 93. South southeast wind 5 to 10 mph.

    High: 93 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 78. Southeast wind around 10 mph.

    Low: 78 °F

    Partly Cloudy

  • Independence Day

    Independence Day: Mostly sunny, with a high near 95. South southwest wind 5 to 10 mph.

    High: 95 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 77. Southeast wind around 5 mph.

    Low: 77 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 94. South wind around 5 mph.

    High: 94 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 93. Heat index values as high as 98. South wind around 10 mph.
Tonight
Clear, with a low around 77. South wind around 10 mph.
Thursday
Sunny, with a high near 93. Heat index values as high as 100. South wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 77. South southeast wind around 10 mph.
Friday
Mostly sunny, with a high near 93. South southeast wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 78. Southeast wind around 10 mph.
Independence Day
Mostly sunny, with a high near 95. South southwest wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 77. Southeast wind around 5 mph.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. South wind around 5 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
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ABOUT THIS FORECAST

 
Point Forecast:
Grayson County Airport TX
 33.71°N 96.66°W (Elev. 797 ft)
6:06 am CDT Jul 1, 2026
8am CDT Jul 1, 2026-6pm CDT Jul 7, 2026
 
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Additional Resources

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