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.

Thunderstorm Rain Fog/Mist

69°F

21°C

Humidity 90%
Wind Speed NW 7 mph
Barometer 29.76 in (1007.3 mb)
Dewpoint 66°F (19°C)
Visibility 4.00 mi
Last update 18 May 8:53 pm CDT
Extended Forecast for

3 Miles SW Union IA

  • Tonight

    Tonight: Showers and thunderstorms before 3am, then showers likely. Some of the storms could produce heavy rainfall. Low around 52. South wind 10 to 13 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 52 °F

    Heavy Rain
    then Showers
    Likely

  • Tuesday

    Tuesday: A 30 percent chance of showers, mainly before 7am. Mostly cloudy, with a high near 61. Breezy, with a northwest wind 16 to 18 mph, with gusts as high as 24 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 61 °F

    Breezy.
    Chance
    Showers then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, then gradually becoming clear, with a low around 40. North wind 5 to 13 mph, with gusts as high as 18 mph.

    Low: 40 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: Increasing clouds, with a high near 62. North northeast wind 6 to 8 mph.

    High: 62 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 44. East northeast wind 3 to 6 mph.

    Low: 44 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers after 1pm. Mostly cloudy, with a high near 62. New precipitation amounts of less than a tenth of an inch possible.

    High: 62 °F

    Partly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.

    Low: 45 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 64. Chance of precipitation is 60%.

    High: 64 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Chance
    Showers

Detailed Forecast

Tonight
Showers and thunderstorms before 3am, then showers likely. Some of the storms could produce heavy rainfall. Low around 52. South wind 10 to 13 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
A 30 percent chance of showers, mainly before 7am. Mostly cloudy, with a high near 61. Breezy, with a northwest wind 16 to 18 mph, with gusts as high as 24 mph. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
Mostly cloudy, then gradually becoming clear, with a low around 40. North wind 5 to 13 mph, with gusts as high as 18 mph.
Wednesday
Increasing clouds, with a high near 62. North northeast wind 6 to 8 mph.
Wednesday Night
Mostly cloudy, with a low around 44. East northeast wind 3 to 6 mph.
Thursday
A 30 percent chance of showers after 1pm. Mostly cloudy, with a high near 62. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 64. Chance of precipitation is 60%.
Friday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 47.
Saturday
Partly sunny, with a high near 73.
Saturday Night
Partly cloudy, with a low around 51.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 56.
Memorial Day
Mostly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Union IA
 42.21°N 93.09°W
Last Update:
9:06 pm CDT May 18, 2026
Forecast Valid:
10pm CDT May 18, 2026-6pm CDT May 25, 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