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

Severe Thunderstorms; Excessive Rainfall; Dangerous Heat; Air Quality Concerns and the Tropics

Wildfire smoke will push into the Midwest, worsening air quality. A frontal system brings severe storms from the Northern Plains to the Mid‑Atlantic the next few days. Heavy Gulf Coast rain is possible as Tropical Depression Two has formed, while monsoonal storms persist in the Southwest with heavy rainfall. Hazardous heat expands from the Plains into the Lower Mississippi Valley. Read More >

Current conditions at

Dallas / Addison Airport (KADS)

Lat: 32.97°NLon: 96.83°WElev: 643ft.

Partly Cloudy

95°F

35°C

Humidity 34%
Wind Speed S 8 mph
Barometer 29.91 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 19 Jul 6:47 pm CDT
Extended Forecast for

Lewisville TX

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly clear, with a low around 80. South southwest wind 5 to 10 mph.

    Low: 80 °F

    Chance
    T-storms then
    Clear

  • Monday

    Monday: Sunny and hot, with a high near 102. Heat index values as high as 108. Southwest wind around 5 mph.

    High: 102 °F

    Hot

  • Monday Night

    Monday Night: Clear, with a low around 81. South wind 5 to 10 mph.

    Low: 81 °F

    Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 104. Heat index values as high as 110. West southwest wind around 5 mph.

    High: 104 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 84. South wind around 5 mph.

    Low: 84 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 105. West northwest wind around 5 mph becoming east in the afternoon.

    High: 105 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 84. East wind 5 to 10 mph.

    Low: 84 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 103. Southeast wind 5 to 10 mph.

    High: 103 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 82. South southeast wind 5 to 10 mph.

    Low: 82 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly clear, with a low around 80. South southwest wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 102. Heat index values as high as 108. Southwest wind around 5 mph.
Monday Night
Clear, with a low around 81. South wind 5 to 10 mph.
Tuesday
Sunny and hot, with a high near 104. Heat index values as high as 110. West southwest wind around 5 mph.
Tuesday Night
Clear, with a low around 84. South wind around 5 mph.
Wednesday
Sunny and hot, with a high near 105. West northwest wind around 5 mph becoming east in the afternoon.
Wednesday Night
Mostly clear, with a low around 84. East wind 5 to 10 mph.
Thursday
Sunny and hot, with a high near 103. Southeast wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 82. South southeast wind 5 to 10 mph.
Friday
Sunny and hot, with a high near 102.
Friday Night
Mostly clear, with a low around 83.
Saturday
Sunny and hot, with a high near 101.
Saturday Night
Mostly clear, with a low around 82.
Sunday
Sunny and hot, with a high near 102.
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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 pm CDT Jul 19, 2026
Forecast Valid:
6pm CDT Jul 19, 2026-6pm CDT Jul 26, 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