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

72°F

22°C

Humidity 56%
Wind Speed Calm
Barometer 30.18 in
Dewpoint 55°F (13°C)
Visibility NA
Last update 1 Sep 5:15 pm CDT
Extended Forecast for

Hartwick IA

  • Tonight

    Tonight: Mostly clear, with a low around 54. Calm wind.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78. Calm wind.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 58. Calm wind becoming west southwest around 5 mph after midnight. Chance of precipitation is 20%.

    Low: 58 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 71. West southwest wind 6 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 71 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 43. Northwest wind 6 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 10%.

    Low: 43 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms, then a chance of showers after 1am. Partly cloudy, with a low around 50. Chance of precipitation is 40%.

    Low: 50 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 54. Calm wind.
Tuesday
Mostly sunny, with a high near 78. Calm wind.
Tuesday Night
A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 58. Calm wind becoming west southwest around 5 mph after midnight. Chance of precipitation is 20%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 71. West southwest wind 6 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 43. Northwest wind 6 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 10%.
Thursday
Sunny, with a high near 67.
Thursday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Partly cloudy, with a low around 50. Chance of precipitation is 40%.
Friday
Sunny, with a high near 67.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 68.
Saturday Night
Mostly clear, with a low around 44.
Sunday
Sunny, with a high near 72.
Sunday Night
Partly cloudy, with a low around 48.
Monday
Mostly sunny, with a high near 74.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hartwick IA
 41.79°N 92.34°W
Last Update:
5:34 pm CDT Sep 1, 2025
Forecast Valid:
5pm CDT Sep 1, 2025-6pm CDT Sep 8, 2025
 
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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