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.

Fog/Mist

33°F

1°C

Humidity 96%
Wind Speed NE 9 mph
Barometer 30.19 in (1023.1 mb)
Dewpoint 32°F (0°C)
Visibility 3.00 mi
Wind Chill25°F (-4°C)
Last update 4 Mar 12:53 am CST
Extended Forecast for

Union IA

Dense Fog Advisory until March 4, 10:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until March 4, 10:00am

    NOW until 10:00am Wed

    Dense Fog Advisory

  • Overnight

    Low: 30 °F

    Areas
    Freezing Fog
    and Areas Fog

  • Wednesday

    Wednesday: A slight chance of drizzle after 3pm. Patchy fog between 7am and 10am. Areas of freezing fog before 7am. Otherwise, partly sunny, with a high near 50. Calm wind becoming east around 6 mph.

    High: 50 °F

    Areas
    Freezing Fog
    and Patchy
    Fog then
    Slight Chance
    Drizzle

  • Wednesday Night

    Wednesday Night: A slight chance of rain before 9pm, then a chance of rain after midnight. Patchy dense fog after 11pm. Otherwise, mostly cloudy, with a low around 37. Calm wind. Chance of precipitation is 30%.

    Low: 37 °F

    Chance Rain
    and Patchy
    Dense Fog

  • Thursday

    Thursday: Areas of dense fog before 10am. Otherwise, partly sunny, with a high near 57. Calm wind becoming south southeast around 6 mph in the afternoon.

    High: 57 °F

    Areas Dense
    Fog then
    Partly Sunny

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm after midnight. Low around 44. Southeast wind 6 to 11 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 44 °F

    Partly Cloudy
    then Rain

  • Friday

    Friday: Rain and possibly a thunderstorm. High near 66. Breezy. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 66 °F

    Rain and
    Breezy

  • Friday Night

    Friday Night: Rain likely and possibly a thunderstorm before midnight, then a chance of rain. Mostly cloudy, with a low around 32. Breezy. Chance of precipitation is 70%.

    Low: 32 °F

    Rain Likely
    then Chance
    Rain and
    Breezy

  • Saturday

    Saturday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

Detailed Forecast

Overnight
Patchy fog before 4am, then areas of fog after 5am. Areas of freezing fog between 4am and 5am. Otherwise, mostly cloudy, with a low around 30. Light north northeast wind.
Wednesday
A slight chance of drizzle after 3pm. Patchy fog between 7am and 10am. Areas of freezing fog before 7am. Otherwise, partly sunny, with a high near 50. Calm wind becoming east around 6 mph.
Wednesday Night
A slight chance of rain before 9pm, then a chance of rain after midnight. Patchy dense fog after 11pm. Otherwise, mostly cloudy, with a low around 37. Calm wind. Chance of precipitation is 30%.
Thursday
Areas of dense fog before 10am. Otherwise, partly sunny, with a high near 57. Calm wind becoming south southeast around 6 mph in the afternoon.
Thursday Night
Rain and possibly a thunderstorm after midnight. Low around 44. Southeast wind 6 to 11 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Rain and possibly a thunderstorm. High near 66. Breezy. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night
Rain likely and possibly a thunderstorm before midnight, then a chance of rain. Mostly cloudy, with a low around 32. Breezy. Chance of precipitation is 70%.
Saturday
Sunny, with a high near 49.
Saturday Night
Mostly clear, with a low around 34.
Sunday
Mostly sunny, with a high near 62. Breezy.
Sunday Night
Mostly clear, with a low around 41.
Monday
Sunny, with a high near 70. Breezy.
Monday Night
Mostly clear, with a low around 47.
Tuesday
A 50 percent chance of rain. Partly sunny, with a high near 62. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Union IA
 42.23°N 93.06°W
Last Update:
12:26 am CST Mar 4, 2026
Forecast Valid:
1am CST Mar 4, 2026-6pm CDT Mar 10, 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