Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

95°F

35°C

Humidity 41%
Wind Speed NE 9 mph
Barometer 30.02 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 27 Aug 1:50 pm CDT
Extended Forecast for

Denison TX

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 98. Heat index values as high as 102. Northeast wind around 10 mph.

    High: 98 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 75. East northeast wind around 5 mph becoming calm  in the evening.

    Low: 75 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 100. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 100 °F

    Hot

  • Friday Night

    Friday Night: Clear, with a low around 76. East northeast wind around 5 mph becoming southeast after midnight.

    Low: 76 °F

    Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 100. South southeast wind around 5 mph.

    High: 100 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 78. Southeast wind around 5 mph.

    Low: 78 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 101. South wind 5 to 10 mph.

    High: 101 °F

    Hot

  • Sunday Night

    Sunday Night: Clear, with a low around 78. South southeast wind 5 to 10 mph.

    Low: 78 °F

    Clear

  • Monday

    Monday: Sunny and hot, with a high near 100. South wind around 10 mph.

    High: 100 °F

    Hot

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 98. Heat index values as high as 102. Northeast wind around 10 mph.
Tonight
Mostly clear, with a low around 75. East northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny and hot, with a high near 100. Calm wind becoming northeast around 5 mph in the afternoon.
Friday Night
Clear, with a low around 76. East northeast wind around 5 mph becoming southeast after midnight.
Saturday
Sunny and hot, with a high near 100. South southeast wind around 5 mph.
Saturday Night
Mostly clear, with a low around 78. Southeast wind around 5 mph.
Sunday
Sunny and hot, with a high near 101. South wind 5 to 10 mph.
Sunday Night
Clear, with a low around 78. South southeast wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 100. South wind around 10 mph.
Monday Night
Clear, with a low around 78.
Tuesday
Sunny and hot, with a high near 100.
Tuesday Night
Mostly clear, with a low around 78.
Wednesday
Sunny and hot, with a high near 100.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Denison TX
 33.75°N 96.57°W (Elev. 748 ft)
1:26 pm CDT Aug 27, 2026
2pm CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database