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

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Fair

16°F

-9°C

Humidity 73%
Wind Speed Calm
Barometer 30.22 in
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Last update 23 Feb 10:55 pm CST
Extended Forecast for

Hartwick IA

  • Tonight

    Tonight: Mostly cloudy, with a temperature rising to around 20 by 5am. Wind chill values as low as 5. South wind 6 to 13 mph, with gusts as high as 22 mph.

    Low: 12 °F⇑

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 43. Wind chill values as low as 10. South wind 10 to 14 mph becoming west in the afternoon. Winds could gust as high as 25 mph.

    High: 43 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 18. Northwest wind 7 to 9 mph.

    Low: 18 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: A 20 percent chance of snow after noon. Increasing clouds, with a high near 31. Northwest wind 5 to 7 mph becoming northeast in the afternoon.

    High: 31 °F

    Mostly Sunny
    then Slight
    Chance Snow

  • Wednesday Night

    Wednesday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 21. East northeast wind around 6 mph. New snow accumulation of 1 to 2 inches possible.

    Low: 21 °F

    Chance Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 26.

    Low: 26 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a temperature rising to around 20 by 5am. Wind chill values as low as 5. South wind 6 to 13 mph, with gusts as high as 22 mph.
Tuesday
Mostly cloudy, with a high near 43. Wind chill values as low as 10. South wind 10 to 14 mph becoming west in the afternoon. Winds could gust as high as 25 mph.
Tuesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 18. Northwest wind 7 to 9 mph.
Wednesday
A 20 percent chance of snow after noon. Increasing clouds, with a high near 31. Northwest wind 5 to 7 mph becoming northeast in the afternoon.
Wednesday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 21. East northeast wind around 6 mph. New snow accumulation of 1 to 2 inches possible.
Thursday
Mostly sunny, with a high near 38.
Thursday Night
Mostly clear, with a low around 26.
Friday
Sunny, with a high near 55.
Friday Night
Mostly clear, with a low around 25.
Saturday
Mostly sunny, with a high near 37. Breezy.
Saturday Night
Partly cloudy, with a low around 15.
Sunday
A 40 percent chance of snow. Partly sunny, with a high near 29.
Sunday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 16.
Monday
A 30 percent chance of snow. Partly sunny, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hartwick IA
 41.79°N 92.34°W
Last Update:
10:51 pm CST Feb 23, 2026
Forecast Valid:
11pm CST Feb 23, 2026-6pm CST Mar 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation