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

59°F

15°C

Humidity 56%
Wind Speed SE 8 mph
Barometer 29.77 in (1007.5 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 15 May 3:53 am CDT
Extended Forecast for

Union IA

  • Today

    Today: Sunny, with a high near 88. South wind 7 to 13 mph, with gusts as high as 18 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 57. South wind 6 to 11 mph becoming light and variable after midnight. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 57 °F

    T-storms
    Likely

  • Saturday

    Saturday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 84. Light and variable wind becoming east northeast 5 to 8 mph in the morning. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 84 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 59. East southeast wind 8 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 59 °F

    Chance
    T-storms then
    Showers

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87. Windy, with a south wind 14 to 19 mph increasing to 21 to 26 mph in the afternoon. Winds could gust as high as 38 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Chance
    T-storms and
    Windy

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 63. Windy. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 63 °F

    Chance
    T-storms and
    Windy then
    T-storms
    Likely and
    Breezy

  • Monday

    Monday: Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Partly sunny, with a high near 87. Windy. Chance of precipitation is 60%.

    High: 87 °F

    Windy.
    Showers
    Likely then
    T-storms
    Likely

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 58. Windy. Chance of precipitation is 80%.

    Low: 58 °F

    Showers and
    Windy

  • Tuesday

    Tuesday: Partly sunny, with a high near 74. Windy.

    High: 74 °F

    Partly Sunny
    and Windy

Detailed Forecast

Today
Sunny, with a high near 88. South wind 7 to 13 mph, with gusts as high as 18 mph.
Tonight
Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 57. South wind 6 to 11 mph becoming light and variable after midnight. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 84. Light and variable wind becoming east northeast 5 to 8 mph in the morning. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 59. East southeast wind 8 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87. Windy, with a south wind 14 to 19 mph increasing to 21 to 26 mph in the afternoon. Winds could gust as high as 38 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 63. Windy. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Partly sunny, with a high near 87. Windy. Chance of precipitation is 60%.
Monday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 58. Windy. Chance of precipitation is 80%.
Tuesday
Partly sunny, with a high near 74. Windy.
Tuesday Night
Partly cloudy, with a low around 44. Breezy.
Wednesday
Mostly sunny, with a high near 67.
Wednesday Night
Partly cloudy, with a low around 44.
Thursday
Mostly sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Union IA
 42.23°N 93.06°W
Last Update:
1:51 am CDT May 15, 2026
Forecast Valid:
4am CDT May 15, 2026-6pm CDT May 21, 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