Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

86°F

30°C

Humidity 49%
Wind Speed SW 12 mph
Barometer 29.94 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 19 Aug 3:55 am CDT
Extended Forecast for

Denison TX

Extreme Heat Warning August 19, 04:10am until August 19, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 19, 04:10am until August 19, 08:00pm

    NOW until 8:00pm Wed

    Extreme Heat Warning

  • Today

    High: 106 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 83. South wind 5 to 10 mph.

    Low: 83 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 105. Heat index values as high as 109. Southwest wind 5 to 10 mph.

    High: 105 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 80. East wind around 5 mph becoming south in the evening.

    Low: 80 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 104. East wind around 5 mph becoming west in the afternoon.

    High: 104 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 80. South southwest wind around 5 mph becoming east southeast in the evening.

    Low: 80 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 104. South southwest wind around 5 mph.

    High: 104 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 80. South wind around 5 mph.

    Low: 80 °F

    Mostly Clear

Detailed Forecast

Today
Sunny and hot, with a high near 106. South southwest wind around 10 mph.
Tonight
Mostly clear, with a low around 83. South wind 5 to 10 mph.
Thursday
Sunny and hot, with a high near 105. Heat index values as high as 109. Southwest wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 80. East wind around 5 mph becoming south in the evening.
Friday
Sunny and hot, with a high near 104. East wind around 5 mph becoming west in the afternoon.
Friday Night
Mostly clear, with a low around 80. South southwest wind around 5 mph becoming east southeast in the evening.
Saturday
Sunny and hot, with a high near 104. South southwest wind around 5 mph.
Saturday Night
Mostly clear, with a low around 80. South wind around 5 mph.
Sunday
Sunny and hot, with a high near 105. South southwest wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 82.
Monday
Sunny and hot, with a high near 105.
Monday Night
Mostly clear, with a low around 82.
Tuesday
Sunny and hot, with a high near 104.
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ABOUT THIS FORECAST

 
Point Forecast:
Denison TX
 33.75°N 96.57°W (Elev. 748 ft)
1:26 am CDT Aug 19, 2026
4am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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