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.

Fair

68°F

20°C

Humidity 96%
Wind Speed Calm
Barometer 29.94 in (1012.9 mb)
Dewpoint 67°F (19°C)
Visibility 8.00 mi
Last update 29 Jul 2:53 am CDT
Extended Forecast for

Grundy Center IA

  • Overnight

    Overnight: Partly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Patchy smoke after 3pm. Mostly sunny, with a high near 86. South southeast wind 3 to 6 mph.

    High: 86 °F

    Mostly Sunny
    then Patchy
    Smoke

  • Wednesday Night

    Wednesday Night: Patchy smoke before 3am. Partly cloudy, with a low around 66. Southeast wind around 7 mph.

    Low: 66 °F

    Patchy Smoke

  • Thursday

    Thursday: Increasing clouds, with a high near 84. South wind 6 to 10 mph.

    High: 84 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 65. South wind 10 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 65 °F

    Chance
    Showers then
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 76. Breezy. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

    High: 76 °F

    Showers and
    Breezy

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Windy. Chance of precipitation is 40%.

    Low: 61 °F

    Chance
    T-storms and
    Windy then
    Chance
    Showers and
    Breezy

  • Saturday

    Saturday: Mostly sunny, with a high near 80. Windy.

    High: 80 °F

    Mostly Sunny
    and Windy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 67. Calm wind.
Wednesday
Patchy smoke after 3pm. Mostly sunny, with a high near 86. South southeast wind 3 to 6 mph.
Wednesday Night
Patchy smoke before 3am. Partly cloudy, with a low around 66. Southeast wind around 7 mph.
Thursday
Increasing clouds, with a high near 84. South wind 6 to 10 mph.
Thursday Night
A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 65. South wind 10 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Friday
Showers and possibly a thunderstorm. High near 76. Breezy. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Windy. Chance of precipitation is 40%.
Saturday
Mostly sunny, with a high near 80. Windy.
Saturday Night
Mostly clear, with a low around 61.
Sunday
Sunny, with a high near 82.
Sunday Night
Mostly clear, with a low around 61.
Monday
Sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 64.
Tuesday
Mostly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grundy Center IA
 42.36°N 92.76°W
Last Update:
3:42 am CDT Jul 29, 2026
Forecast Valid:
3am CDT Jul 29, 2026-6pm CDT Aug 4, 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