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

88°F

31°C

Humidity 45%
Wind Speed S 16 mph
Barometer 29.94 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 19 Aug 2:55 am CDT
Extended Forecast for

4 Miles NE Willis OK

Extreme Heat Warning August 19, 11:00am until August 19, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  • Overnight

    Overnight: Clear, with a low around 82. South southwest wind around 8 mph.

    Low: 82 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 109. Heat index values as high as 112. South southwest wind 7 to 10 mph.

    High: 109 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 82. South southwest wind 7 to 9 mph.

    Low: 82 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 107. Heat index values as high as 110. Southwest wind 6 to 8 mph becoming east southeast in the afternoon.

    High: 107 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 79. East wind 3 to 6 mph.

    Low: 79 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 105.

    High: 105 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 79.

    Low: 79 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 105.

    High: 105 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 80.

    Low: 80 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 82. South southwest wind around 8 mph.
Wednesday
Sunny and hot, with a high near 109. Heat index values as high as 112. South southwest wind 7 to 10 mph.
Wednesday Night
Mostly clear, with a low around 82. South southwest wind 7 to 9 mph.
Thursday
Sunny and hot, with a high near 107. Heat index values as high as 110. Southwest wind 6 to 8 mph becoming east southeast in the afternoon.
Thursday Night
Mostly clear, with a low around 79. East wind 3 to 6 mph.
Friday
Sunny and hot, with a high near 105.
Friday Night
Mostly clear, with a low around 79.
Saturday
Sunny and hot, with a high near 105.
Saturday Night
Mostly clear, with a low around 80.
Sunday
Sunny and hot, with a high near 107.
Sunday Night
Mostly clear, with a low around 81.
Monday
Mostly sunny and hot, with a high near 106.
Monday Night
Mostly clear, with a low around 81.
Tuesday
Sunny and hot, with a high near 106.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NE Willis OK
 33.93°N 96.77°W
1:26 am CDT Aug 19, 2026
3am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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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