Areas of Dangerous Heat and Severe Thunderstorms

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 before returning over much of the Plains into next week. Scattered strong to severe thunderstorms are possible across parts of the Northeast U.S. on Thursday. Damaging wind, hail, and a tornado or two are possible. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

81°F

27°C

Humidity 74%
Wind Speed Calm
Barometer 29.97 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 27 Aug 12:35 am CDT
Extended Forecast for

2 Miles SW Denison TX

Heat Advisory August 27, 12:50am until August 27, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 27, 12:50am until August 27, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • Overnight

    Low: 76 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Sunny and hot, with a high near 99. Heat index values as high as 105. Northeast wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 74. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 74 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 97. Heat index values as high as 103. Calm wind becoming east around 5 mph in the morning.

    High: 97 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. Southeast wind around 5 mph.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 99. South wind around 5 mph.

    High: 99 °F

    Hot

  • Saturday Night

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

    Low: 77 °F

    Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 99. South wind around 10 mph.

    High: 99 °F

    Hot

Detailed Forecast

Overnight
A 20 percent chance of showers before 1am. Mostly clear, with a low around 76. East northeast wind around 5 mph.
Thursday
Sunny and hot, with a high near 99. Heat index values as high as 105. Northeast wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 74. Northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 97. Heat index values as high as 103. Calm wind becoming east around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 75. Southeast wind around 5 mph.
Saturday
Sunny and hot, with a high near 99. South wind around 5 mph.
Saturday Night
Clear, with a low around 77. South southeast wind around 5 mph.
Sunday
Sunny and hot, with a high near 99. South wind around 10 mph.
Sunday Night
Clear, with a low around 77. South wind around 10 mph.
Monday
Sunny, with a high near 98.
Monday Night
Mostly clear, with a low around 78.
Tuesday
Sunny, with a high near 98.
Tuesday Night
Mostly clear, with a low around 78.
Wednesday
Sunny and hot, with a high near 100.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW Denison TX
 33.73°N 96.6°W (Elev. 702 ft)
9:26 pm CDT Aug 26, 2026
12am CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database