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

Dangerous Heat in the Central and Eastern U.S.; Severe Thunderstorms in the Great Lakes

Thunderstorms with strong wind gusts and hail will be possible today from Michigan into the Lower Great Lakes region. A significant and dangerous heat wave will expand from the Central U.S. into the Eastern U.S this weekend through much of next week. Numerous daily record highs and warm lows are likely. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Overcast

88°F

31°C

Humidity 59%
Wind Speed S 12 mph
Barometer 30.03 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 21 Jun 12:50 pm CDT
Extended Forecast for

Collinsville TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 93. Heat index values as high as 101. South wind around 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 74. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 92. Heat index values as high as 97. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 92 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 93. South wind 5 to 10 mph.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. South southeast wind 5 to 10 mph.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. South wind 5 to 10 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.

    Low: 74 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 93. South southeast wind 5 to 10 mph.

    High: 93 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 93. Heat index values as high as 101. South wind around 15 mph, with gusts as high as 25 mph.
Tonight
Clear, with a low around 74. South wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 92. Heat index values as high as 97. South wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 74. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 93. South wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 73. South southeast wind 5 to 10 mph.
Tuesday
Sunny, with a high near 93. South wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.
Wednesday
Sunny, with a high near 93. South southeast wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 72.
Thursday
Mostly sunny, with a high near 93.
Thursday Night
Mostly clear, with a low around 73.
Friday
Sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Collinsville TX
 33.57°N 96.9°W (Elev. 722 ft)
Last Update:
12:47 pm CDT Jun 21, 2025
Forecast Valid:
1pm CDT Jun 21, 2025-6pm CDT Jun 27, 2025
 
Forecast Discussion
 
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Additional Resources

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