National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorms and Critical Fire Weather Wednesday

Scattered severe thunderstorms are possible across portions of the northern High Plains Wednesday afternoon and evening. Severe wind gusts are the primary hazard. Gusty winds and low relative humidity will contribute to critical fire weather conditions across parts of the northern Great Plains and Great Basin Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Marshalltown, Marshalltown Municipal Airport (KMIW)

Lat: 42.11°NLon: 92.92°WElev: 971ft.

Fair

56°F

13°C

Humidity 44%
Wind Speed NW 10 mph
Barometer 30.00 in (1015.6 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 12 May 10:53 pm CDT
Extended Forecast for

Grundy Center IA

  • Tonight

    Tonight: Clear, with a low around 48. Northwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 48 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 72. Breezy, with a north northwest wind 10 to 16 mph, with gusts as high as 23 mph.

    High: 72 °F

    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Clear, with a low around 45. North wind 5 to 9 mph becoming light and variable.

    Low: 45 °F

    Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 76. Windy, with a south southeast wind 9 to 14 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 76 °F

    Increasing
    Clouds and
    Windy

  • Thursday Night

    Thursday Night: A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then a chance of showers after 1am. Mostly cloudy, with a low around 54. Breezy, with a south southeast wind 13 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Chance
    Showers and
    Breezy

  • Friday

    Friday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 55.

    Low: 55 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers after 1pm. Sunny, with a high near 85.

    High: 85 °F

    Sunny then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.

    Low: 57 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Clear, with a low around 48. Northwest wind around 10 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 72. Breezy, with a north northwest wind 10 to 16 mph, with gusts as high as 23 mph.
Wednesday Night
Clear, with a low around 45. North wind 5 to 9 mph becoming light and variable.
Thursday
Increasing clouds, with a high near 76. Windy, with a south southeast wind 9 to 14 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 30 mph.
Thursday Night
A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then a chance of showers after 1am. Mostly cloudy, with a low around 54. Breezy, with a south southeast wind 13 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Sunny, with a high near 86.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 55.
Saturday
A 20 percent chance of showers after 1pm. Sunny, with a high near 85.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Sunday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 84. Windy.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 60. Breezy. Chance of precipitation is 70%.
Monday
A 50 percent chance of showers. Partly sunny, with a high near 79. Breezy.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 53.
Tuesday
Mostly sunny, with a high near 75.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grundy Center IA
 42.36°N 92.79°W
Last Update:
10:17 pm CDT May 12, 2026
Forecast Valid:
11pm CDT May 12, 2026-6pm CDT May 19, 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