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

Extreme Heat Across the Southern U.S.; Severe Thunderstorms and Heavy Rain in the Northern Plains and Upper Midwest

Dangerous heat will remain across portions of the southern U.S. through the weekend. A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Severe thunderstorms will produce damaging winds and heavy rainfall over portions of the northern/central Plains into the mid/upper-Mississippi Valleys today. Read More >

Hazardous Weather Conditions

Current conditions at

Dallas / Addison Airport (KADS)

Lat: 32.97°NLon: 96.83°WElev: 643ft.

Clear

90°F

32°C

Humidity 46%
Wind Speed SW 8 mph
Barometer 29.99 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 30 Jul 10:47 am CDT
Extended Forecast for

Lewisville TX

Heat Advisory July 30, 11:12am until July 30, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 30, 11:12am until July 30, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • Today

    High: 102 °F

    Hot

  • Tonight

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

    Low: 83 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 104. Heat index values as high as 110. Southwest wind around 10 mph.

    High: 104 °F

    Hot

  • Friday Night

    Friday Night: Partly cloudy, with a low around 83. South southwest wind 5 to 10 mph.

    Low: 83 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 99. North wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 99 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 76. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 96. North wind 5 to 10 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 77. North northeast wind 5 to 10 mph becoming light and variable after midnight.

    Low: 77 °F

    Clear

Detailed Forecast

Today
Mostly sunny and hot, with a high near 102. Heat index values as high as 109. South wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 83. South wind 5 to 10 mph.
Friday
Sunny and hot, with a high near 104. Heat index values as high as 110. Southwest wind around 10 mph.
Friday Night
Partly cloudy, with a low around 83. South southwest wind 5 to 10 mph.
Saturday
Mostly sunny and hot, with a high near 99. North wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 76. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 96. North wind 5 to 10 mph.
Sunday Night
Clear, with a low around 77. North northeast wind 5 to 10 mph becoming light and variable after midnight.
Monday
Sunny, with a high near 98. Calm wind becoming east southeast around 5 mph in the afternoon.
Monday Night
Clear, with a low around 78.
Tuesday
Sunny and hot, with a high near 100.
Tuesday Night
Mostly clear, with a low around 80.
Wednesday
Sunny and hot, with a high near 100.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lewisville TX
 33.05°N 97°W (Elev. 531 ft)
Last Update:
6:11 am CDT Jul 30, 2026
Forecast Valid:
11am CDT Jul 30, 2026-6pm CDT Aug 5, 2026
 
Forecast Discussion
 
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Additional Resources

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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