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

Lala Approaching Hawaii; Flash Flooding Risks; Excessive Heat

Lala, may become a hurricane, is expected to impact Hawaii this weekend. Heavy rainfall, strong winds, dangerous surf and localized flooding are expected. Heavy rainfall and flash flooding concerns from the mid-Mississippi Valley, Ohio Valley into the central Appalachians continues, with the threat shifting toward the mid-Atlantic later this weekend. Record heat continues for areas of the South. Read More >

Hazardous Weather Conditions

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

88°F

31°C

Humidity 62%
Wind Speed S 15 mph
Barometer 30.14 in
Dewpoint 73°F (23°C)
Visibility 9.00 mi
Heat Index96°F (36°C)
Last update 15 Aug 9:50 am CDT
Extended Forecast for

3 Miles W Denison TX

Heat Advisory August 15, 12:00pm until August 15, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Sunny and hot, with a high near 100. Heat index values as high as 105. South wind around 10 mph.

    High: 100 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 79. South southwest wind 5 to 10 mph.

    Low: 79 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 102. Heat index values as high as 105. South southwest wind 5 to 10 mph.

    High: 102 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 78. South wind around 5 mph.

    Low: 78 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 103. West southwest wind around 5 mph.

    High: 103 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 78. South wind around 5 mph.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 103. South southwest wind 5 to 10 mph.

    High: 103 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 80. South wind around 10 mph.

    Low: 80 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 103. South southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 103 °F

    Hot

Detailed Forecast

Today
Sunny and hot, with a high near 100. Heat index values as high as 105. South wind around 10 mph.
Tonight
Mostly clear, with a low around 79. South southwest wind 5 to 10 mph.
Sunday
Sunny and hot, with a high near 102. Heat index values as high as 105. South southwest wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 78. South wind around 5 mph.
Monday
Sunny and hot, with a high near 103. West southwest wind around 5 mph.
Monday Night
Mostly clear, with a low around 78. South wind around 5 mph.
Tuesday
Sunny and hot, with a high near 103. South southwest wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 80. South wind around 10 mph.
Wednesday
Sunny and hot, with a high near 103. South southwest wind around 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 79.
Thursday
Sunny and hot, with a high near 101.
Thursday Night
Partly cloudy, with a low around 77.
Friday
Mostly sunny and hot, with a high near 100.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles W Denison TX
 33.75°N 96.6°W (Elev. 801 ft)
Last Update:
6:12 am CDT Aug 15, 2026
Forecast Valid:
10am CDT Aug 15, 2026-6pm CDT Aug 21, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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