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

Hazardous Weather Conditions

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

86°F

30°C

Humidity 59%
Wind Speed S 10 mph
Barometer 30.19 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 16 Sep 8:50 am CDT
Extended Forecast for

3 Miles NNE Dorchester TX

Heat Advisory September 16, 10:03am until September 16, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 16, 10:03am until September 16, 08:00pm

    NOW until 8:00pm Wed

    Heat Advisory

  • Today

    High: 100 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 76. Southeast wind 5 to 10 mph.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny and hot, with a high near 99. Heat index values as high as 103. South wind around 5 mph.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 75. Southeast wind around 5 mph.

    Low: 75 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 97. South wind 5 to 10 mph.

    High: 97 °F

    Sunny

  • Friday Night

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

    Low: 75 °F

    Mostly Clear

  • Saturday

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

    High: 98 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 74. South wind around 10 mph.

    Low: 74 °F

    Clear

Detailed Forecast

Today
Sunny and hot, with a high near 100. South southeast wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 76. Southeast wind 5 to 10 mph.
Thursday
Mostly sunny and hot, with a high near 99. Heat index values as high as 103. South wind around 5 mph.
Thursday Night
Partly cloudy, with a low around 75. Southeast wind around 5 mph.
Friday
Sunny, with a high near 97. South wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 75. South southeast wind around 5 mph.
Saturday
Sunny, with a high near 98. South southwest wind 5 to 10 mph.
Saturday Night
Clear, with a low around 74. South wind around 10 mph.
Sunday
Sunny, with a high near 97. South southwest wind around 10 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Monday Night
A 30 percent chance of showers. Partly cloudy, with a low around 69.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Dorchester TX
 33.57°N 96.68°W (Elev. 797 ft)
Last Update:
6:06 am CDT Sep 16, 2026
Forecast Valid:
10am CDT Sep 16, 2026-6pm CDT Sep 22, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation