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

70°F

21°C

Humidity 100%
Wind Speed E 3 mph
Barometer 29.96 in (1013.6 mb)
Dewpoint 70°F (21°C)
Visibility 2.00 mi
Last update 1 Sep 6:52 am CDT
Extended Forecast for

Marshalltown IA

Dense Fog Advisory until September 1, 08:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory until September 1, 08:00am

    NOW until 8:00am Tue

    Dense Fog Advisory

  • Today

    High: 92 °F

    Patchy Dense
    Fog then
    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 73. Light and variable wind becoming south southwest 5 to 7 mph in the evening.

    Low: 73 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 92. West southwest wind 5 to 9 mph.

    High: 92 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 72. Calm wind becoming south around 6 mph after midnight.

    Low: 72 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 92. Light south wind increasing to 5 to 9 mph in the morning.

    High: 92 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 93.

    High: 93 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

Detailed Forecast

Today
Patchy dense fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 92. Heat index values as high as 100. Calm wind becoming south around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 73. Light and variable wind becoming south southwest 5 to 7 mph in the evening.
Wednesday
Sunny, with a high near 92. West southwest wind 5 to 9 mph.
Wednesday Night
Mostly clear, with a low around 72. Calm wind becoming south around 6 mph after midnight.
Thursday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 92. Light south wind increasing to 5 to 9 mph in the morning.
Thursday Night
Mostly clear, with a low around 74.
Friday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 93.
Friday Night
Mostly clear, with a low around 72.
Saturday
Mostly sunny, with a high near 95.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.
Sunday
A 30 percent chance of showers. Mostly sunny, with a high near 90.
Sunday Night
Partly cloudy, with a low around 66.
Labor Day
Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marshalltown IA
 42.04°N 92.89°W
Last Update:
6:31 am CDT Sep 1, 2026
Forecast Valid:
7am CDT Sep 1, 2026-6pm CDT Sep 7, 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