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

Marshalltown, Marshalltown Municipal Airport (KMIW)

Lat: 42.11°NLon: 92.92°WElev: 971ft.

Overcast

39°F

4°C

Humidity 93%
Wind Speed E 3 mph
Barometer 29.97 in (1015.5 mb)
Dewpoint 37°F (3°C)
Visibility 8.00 mi
Last update 4 Mar 11:53 pm CST
Extended Forecast for

Union IA

  • Overnight

    Overnight: A chance of sprinkles before 5am. Patchy fog after 4am. Otherwise, cloudy, with a low around 38. Calm wind.

    Low: 38 °F

    Chance
    Sprinkles and
    Patchy Fog

  • Thursday

    Thursday: Patchy fog between 11am and noon. Otherwise, mostly cloudy, with a high near 55. Calm wind becoming east southeast around 6 mph in the afternoon.

    High: 55 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3am. Patchy fog after 4am. Low around 44. Southeast wind 6 to 13 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 44 °F

    Mostly Cloudy
    then Showers
    and Patchy
    Fog

  • Friday

    Friday: Showers and possibly a thunderstorm. Patchy fog before 10am. High near 70. Breezy, with a south wind 13 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 70 °F

    Showers and
    Patchy Fog
    then Showers
    Likely and
    Breezy

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before midnight, then a chance of rain after midnight. Low around 32. Breezy, with a south southwest wind 13 to 17 mph becoming west northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 32 °F

    Breezy.
    Showers then
    Chance Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 47. Breezy.

    High: 47 °F

    Partly Sunny
    and Breezy
    then Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 33.

    Low: 33 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 62. Breezy.

    High: 62 °F

    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Clear, with a low around 44.

    Low: 44 °F

    Clear

Detailed Forecast

Overnight
A chance of sprinkles before 5am. Patchy fog after 4am. Otherwise, cloudy, with a low around 38. Calm wind.
Thursday
Patchy fog between 11am and noon. Otherwise, mostly cloudy, with a high near 55. Calm wind becoming east southeast around 6 mph in the afternoon.
Thursday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3am. Patchy fog after 4am. Low around 44. Southeast wind 6 to 13 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers and possibly a thunderstorm. Patchy fog before 10am. High near 70. Breezy, with a south wind 13 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Showers and possibly a thunderstorm before midnight, then a chance of rain after midnight. Low around 32. Breezy, with a south southwest wind 13 to 17 mph becoming west northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Mostly sunny, with a high near 47. Breezy.
Saturday Night
Clear, with a low around 33.
Sunday
Sunny, with a high near 62. Breezy.
Sunday Night
Clear, with a low around 44.
Monday
Sunny, with a high near 69.
Monday Night
Mostly clear, with a low around 43.
Tuesday
A 50 percent chance of rain. Mostly sunny, with a high near 65. Breezy.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 29. Blustery. Chance of precipitation is 50%.
Wednesday
A chance of rain and snow. Partly sunny, with a high near 44. Breezy. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Union IA
 42.23°N 93.06°W
Last Update:
12:26 am CST Mar 5, 2026
Forecast Valid:
12am CST Mar 5, 2026-6pm CDT Mar 11, 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