Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

Dangerous heat will persist across the Southwest U.S. through this week, easing by next week. The heat will focus further east in the Great Plains and Mississippi Valley beginning next week. Elevated to locally critical fire weather conditions will persist for the Great Basin today. Poor air quality lingers for the Northwest, Great Basin, Central Rockies into the Plains. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

99°F

37°C

Humidity 31%
Wind Speed SE 12 G 17 mph
Barometer 29.95 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index101°F (38°C)
Last update 4 Aug 1:50 pm CDT
Extended Forecast for

Collinsville TX

  • This Afternoon

    This Afternoon: Sunny and hot, with a high near 101. South wind around 5 mph.

    High: 101 °F

    Hot

  • Tonight

    Tonight: Clear, with a low around 77. South southeast wind around 5 mph.

    Low: 77 °F

    Clear

  • Wednesday

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

    High: 100 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 78. South southeast wind around 5 mph.

    Low: 78 °F

    Clear

  • Thursday

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

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 77. South southeast wind around 5 mph.

    Low: 77 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 98. South wind 5 to 10 mph.

    High: 98 °F

    Sunny

  • Friday Night

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

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 98. South southwest wind around 5 mph.

    High: 98 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny and hot, with a high near 101. South wind around 5 mph.
Tonight
Clear, with a low around 77. South southeast wind around 5 mph.
Wednesday
Sunny and hot, with a high near 100. South wind 5 to 10 mph.
Wednesday Night
Clear, with a low around 78. South southeast wind around 5 mph.
Thursday
Sunny and hot, with a high near 99. South wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 77. South southeast wind around 5 mph.
Friday
Sunny, with a high near 98. South wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 76. South southeast wind around 5 mph.
Saturday
Sunny, with a high near 98. South southwest wind around 5 mph.
Saturday Night
Clear, with a low around 77.
Sunday
Sunny, with a high near 98.
Sunday Night
Clear, with a low around 77.
Monday
Sunny, with a high near 98.
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ABOUT THIS FORECAST

 
Point Forecast:
Collinsville TX
 33.55°N 96.9°W (Elev. 696 ft)
1:26 pm CDT Aug 4, 2026
2pm CDT Aug 4, 2026-6pm CDT Aug 10, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database