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

22°F

-6°C

Humidity 87%
Wind Speed Calm
Barometer 29.92 in
Dewpoint 18°F (-8°C)
Visibility 7.00 mi
Last update 8 Dec 11:35 pm CST
Extended Forecast for

Hartwick IA

  • Tonight

    Tonight: Mostly cloudy, with a temperature rising to around 27 by 2am. South wind 8 to 10 mph becoming west southwest after midnight. Winds could gust as high as 18 mph.

    Low: 23 °F⇑

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of rain, mainly after 5pm. Mostly cloudy, with a high near 37. West wind 6 to 15 mph becoming south in the afternoon. Winds could gust as high as 24 mph.

    High: 37 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: A chance of rain before 3am, then a slight chance of snow showers. Areas of blowing snow after 4am. Mostly cloudy, with a low around 25. Windy, with a southwest wind 15 to 20 mph becoming west northwest 25 to 30 mph after midnight. Winds could gust as high as 49 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.

    Low: 25 °F

    Chance
    Rain/Snow and
    Areas Blowing
    Snow

  • Wednesday

    Wednesday: Areas of blowing snow before 8am. Mostly cloudy, with a temperature rising to near 28 by noon, then falling to around 24 during the remainder of the day. Windy, with a northwest wind 25 to 30 mph decreasing to 13 to 18 mph in the afternoon. Winds could gust as high as 48 mph.

    High: 28 °F⇓

    Windy. Areas
    Blowing Snow
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 11. Northwest wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 18 mph.

    Low: 11 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: A 40 percent chance of snow. Mostly cloudy, with a high near 23.

    High: 23 °F

    Chance Snow

  • Thursday Night

    Thursday Night: A 30 percent chance of snow. Mostly cloudy, with a low around 9.

    Low: 9 °F

    Chance Snow

  • Friday

    Friday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 19.

    High: 19 °F

    Slight Chance
    Snow then
    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around -3.

    Low: -3 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a temperature rising to around 27 by 2am. South wind 8 to 10 mph becoming west southwest after midnight. Winds could gust as high as 18 mph.
Tuesday
A 30 percent chance of rain, mainly after 5pm. Mostly cloudy, with a high near 37. West wind 6 to 15 mph becoming south in the afternoon. Winds could gust as high as 24 mph.
Tuesday Night
A chance of rain before 3am, then a slight chance of snow showers. Areas of blowing snow after 4am. Mostly cloudy, with a low around 25. Windy, with a southwest wind 15 to 20 mph becoming west northwest 25 to 30 mph after midnight. Winds could gust as high as 49 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Wednesday
Areas of blowing snow before 8am. Mostly cloudy, with a temperature rising to near 28 by noon, then falling to around 24 during the remainder of the day. Windy, with a northwest wind 25 to 30 mph decreasing to 13 to 18 mph in the afternoon. Winds could gust as high as 48 mph.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 11. Northwest wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 18 mph.
Thursday
A 40 percent chance of snow. Mostly cloudy, with a high near 23.
Thursday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 9.
Friday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 19.
Friday Night
Mostly cloudy, with a low around -3.
Saturday
Mostly cloudy and cold, with a high near 7.
Saturday Night
Mostly cloudy, with a low around -4.
Sunday
Mostly sunny, with a high near 13.
Sunday Night
Mostly cloudy, with a low around 3.
Monday
Partly sunny, with a high near 25.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hartwick IA
 41.79°N 92.37°W
Last Update:
10:46 pm CST Dec 8, 2025
Forecast Valid:
11pm CST Dec 8, 2025-6pm CST Dec 15, 2025
 
Forecast Discussion
 
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Additional Resources

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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