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

Dangerous Heat in the Southwest; Severe Thunderstorms from the Central Plains into the Ohio Valley

Dangerous heat will build across the Southwest U.S. through the end of the week with daytime highs of 110-115°F. Isolated to widely scattered severe storms are expected across parts of the central and southern High Plains, Great Lakes into the Ohio Valley, and parts of the Ozarks to Lower Mississippi Valley today. Read More >

Current conditions at

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

Fair

72°F

22°C

Humidity 71%
Wind Speed NW 14 mph
Barometer 30.00 in (1014.9 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 26 Aug 9:53 am CDT
Extended Forecast for

Thornton IA

  • Today

    Today: Sunny, with a high near 81. Breezy, with a northwest wind 11 to 16 mph, with gusts as high as 23 mph.

    High: 81 °F

    Sunny then
    Sunny and
    Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 57. Northwest wind 5 to 8 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 81. North northwest wind 3 to 8 mph.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 53. Calm wind.

    Low: 53 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 83. Calm wind becoming south around 6 mph in the afternoon.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 64. New precipitation amounts of less than a tenth of an inch possible.

    Low: 64 °F

    Partly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 85. Windy.

    High: 85 °F

    Chance
    Showers and
    Windy

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. Breezy.

    Low: 70 °F

    Breezy.
    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 89. Breezy.

    High: 89 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

Today
Sunny, with a high near 81. Breezy, with a northwest wind 11 to 16 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 57. Northwest wind 5 to 8 mph.
Thursday
Sunny, with a high near 81. North northwest wind 3 to 8 mph.
Thursday Night
Clear, with a low around 53. Calm wind.
Friday
Sunny, with a high near 83. Calm wind becoming south around 6 mph in the afternoon.
Friday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 64. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 50 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 85. Windy.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. Breezy.
Sunday
Mostly sunny, with a high near 89. Breezy.
Sunday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 69.
Monday
Partly sunny, with a high near 86.
Monday Night
A 30 percent chance of showers. Partly cloudy, with a low around 64.
Tuesday
A 30 percent chance of showers. Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Thornton IA
 42.95°N 93.4°W
Last Update:
5:56 am CDT Aug 26, 2026
Forecast Valid:
10am CDT Aug 26, 2026-6pm CDT Sep 1, 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