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

Strong Storms and Heavy Rainfall Threats; Dangerous Heat for Southern Plains into the Southwest

Thunderstorms, some severe, will impact areas of the Plains into the Midwest today. Rainfall can be locally heavy as well from these storms with isolated instances of flash flooding. Monsoonal flow will enhance rainfall across the Four Corners into the central Rockies today. Meanwhile, summer heat continues for the southern Plains, Southwest into southern California. Read More >

Current conditions at

Marshalltown, Marshalltown Municipal Airport (KMIW)

Lat: 42.11°NLon: 92.92°WElev: 971ft.

Fair

80°F

27°C

Humidity 67%
Wind Speed S 8 mph
Barometer 30.00 in (1015.5 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 25 Aug 4:53 pm CDT
Extended Forecast for

Marshalltown IA

  • Tonight

    Tonight: Partly cloudy, with a low around 64. South southwest wind around 6 mph becoming west after midnight.

    Low: 64 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 84. Northwest wind 5 to 11 mph, with gusts as high as 18 mph.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 60. North northwest wind 3 to 6 mph.

    Low: 60 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 83. North northwest wind 3 to 7 mph.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 57. Calm wind.

    Low: 57 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 86. Chance of precipitation is 20%.

    High: 86 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 64. South southwest wind around 6 mph becoming west after midnight.
Wednesday
Sunny, with a high near 84. Northwest wind 5 to 11 mph, with gusts as high as 18 mph.
Wednesday Night
Mostly clear, with a low around 60. North northwest wind 3 to 6 mph.
Thursday
Sunny, with a high near 83. North northwest wind 3 to 7 mph.
Thursday Night
Clear, with a low around 57. Calm wind.
Friday
Sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 64.
Saturday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 86. Chance of precipitation is 20%.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Monday
Partly sunny, with a high near 88.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.
Tuesday
Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marshalltown IA
 42.04°N 92.92°W
Last Update:
2:57 pm CDT Aug 25, 2026
Forecast Valid:
5pm CDT Aug 25, 2026-6pm CDT Sep 1, 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