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.

Mostly Cloudy

73°F

23°C

Humidity 81%
Wind Speed N 5 mph
Barometer 29.96 in (1013.4 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 2 Sep 5:53 am CDT
Extended Forecast for

Union IA

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly before 8am. Mostly sunny, with a high near 90. East wind 5 to 8 mph becoming south southwest in the afternoon.

    High: 90 °F

    Chance
    T-storms then
    Mostly Sunny

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 3am. Mostly clear, with a low around 72. South wind 3 to 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 72 °F

    Mostly Clear
    then Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly before 11am. Mostly sunny, with a high near 90. Calm wind becoming south 5 to 9 mph in the morning. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Chance
    T-storms then
    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 73. South wind 5 to 8 mph.

    Low: 73 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Friday

    Friday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 92. South wind 5 to 7 mph. Chance of precipitation is 20%.

    High: 92 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

  • Saturday Night

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

    Low: 70 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly before 8am. Mostly sunny, with a high near 90. East wind 5 to 8 mph becoming south southwest in the afternoon.
Tonight
A 40 percent chance of showers and thunderstorms, mainly after 3am. Mostly clear, with a low around 72. South wind 3 to 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
A 50 percent chance of showers and thunderstorms, mainly before 11am. Mostly sunny, with a high near 90. Calm wind becoming south 5 to 9 mph in the morning. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 73. South wind 5 to 8 mph.
Friday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 92. South wind 5 to 7 mph. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 71.
Saturday
Mostly sunny, with a high near 91.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Sunday
A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89.
Sunday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 67.
Labor Day
A 30 percent chance of showers. Mostly sunny, with a high near 85.
Monday Night
Mostly cloudy, with a low around 66.
Tuesday
Partly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Union IA
 42.26°N 93.06°W
Last Update:
4:51 am CDT Sep 2, 2026
Forecast Valid:
6am CDT Sep 2, 2026-6pm CDT Sep 8, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation