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

Hazardous Weather Conditions

Current conditions at

Marshalltown, Marshalltown Municipal Airport (KMIW)

Lat: 42.11°NLon: 92.92°WElev: 971ft.

Fair

90°F

32°C

Humidity 58%
Wind Speed Calm
Barometer 29.95 in (1013.2 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 1 Sep 12:53 pm CDT
Extended Forecast for

Union IA

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms before 4pm. Mostly sunny, with a high near 90. South wind 3 to 5 mph.

    High: 90 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Increasing clouds, with a low around 71. Light and variable wind becoming southwest 5 to 7 mph in the evening.

    Low: 71 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly sunny, with a high near 91. Southwest wind 5 to 9 mph.

    High: 91 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly clear, with a low around 72. South wind 3 to 5 mph.

    Low: 72 °F

    Mostly Clear
    then Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly before 7am. Mostly sunny, with a high near 91. Light and variable wind becoming south 5 to 9 mph in the morning. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 91 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 91.

    High: 91 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms before 4pm. Mostly sunny, with a high near 90. South wind 3 to 5 mph.
Tonight
Increasing clouds, with a low around 71. Light and variable wind becoming southwest 5 to 7 mph in the evening.
Wednesday
Mostly sunny, with a high near 91. Southwest wind 5 to 9 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly clear, with a low around 72. South wind 3 to 5 mph.
Thursday
A 30 percent chance of showers and thunderstorms, mainly before 7am. Mostly sunny, with a high near 91. Light and variable wind becoming south 5 to 9 mph in the morning. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Mostly clear, with a low around 72.
Friday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 91.
Friday Night
Partly cloudy, with a low around 70.
Saturday
Mostly sunny, with a high near 92.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
A 40 percent chance of showers. Mostly sunny, with a high near 87.
Sunday Night
A 30 percent chance of showers. Partly cloudy, with a low around 66.
Labor Day
Partly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Union IA
 42.26°N 93.03°W
Last Update:
1:51 pm CDT Sep 1, 2026
Forecast Valid:
1pm CDT Sep 1, 2026-6pm CDT Sep 7, 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