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.

Fog/Mist

40°F

4°C

Humidity 84%
Wind Speed Calm
Barometer 30.08 in
Dewpoint 36°F (2°C)
Visibility 5.00 mi
Last update 3 Mar 2:15 pm CST
Extended Forecast for

3 Miles NNW Hartwick IA

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 46. East northeast wind 3 to 5 mph.

    High: 46 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 32. Calm wind becoming northeast around 5 mph after midnight.

    Low: 32 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of drizzle before 7am, then a slight chance of drizzle or freezing rain between 7am and 8am, then a chance of drizzle after 8am. Mostly cloudy, with a high near 49. East northeast wind around 6 mph becoming calm in the afternoon. Chance of precipitation is 20%.

    High: 49 °F

    Slight Chance
    Drizzle/Freezing
    Rain then
    Chance
    Drizzle

  • Wednesday Night

    Wednesday Night: Showers likely, mainly after midnight. Patchy fog between 8pm and midnight. Otherwise, cloudy, with a low around 39. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 39 °F

    Showers
    Likely and
    Patchy Fog

  • Thursday

    Thursday: A 20 percent chance of showers before noon. Partly sunny, with a high near 59. Calm wind becoming south around 6 mph in the afternoon.

    High: 59 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after midnight. Partly cloudy, with a low around 44. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 44 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 69. Chance of precipitation is 100%.

    High: 69 °F

    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Rain and possibly a thunderstorm before midnight, then a chance of rain. Low around 39. Chance of precipitation is 80%.

    Low: 39 °F

    Rain then
    Chance Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 46. East northeast wind 3 to 5 mph.
Tonight
Mostly cloudy, with a low around 32. Calm wind becoming northeast around 5 mph after midnight.
Wednesday
A slight chance of drizzle before 7am, then a slight chance of drizzle or freezing rain between 7am and 8am, then a chance of drizzle after 8am. Mostly cloudy, with a high near 49. East northeast wind around 6 mph becoming calm in the afternoon. Chance of precipitation is 20%.
Wednesday Night
Showers likely, mainly after midnight. Patchy fog between 8pm and midnight. Otherwise, cloudy, with a low around 39. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
A 20 percent chance of showers before noon. Partly sunny, with a high near 59. Calm wind becoming south around 6 mph in the afternoon.
Thursday Night
Showers likely and possibly a thunderstorm after midnight. Partly cloudy, with a low around 44. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers and possibly a thunderstorm. High near 69. Chance of precipitation is 100%.
Friday Night
Rain and possibly a thunderstorm before midnight, then a chance of rain. Low around 39. Chance of precipitation is 80%.
Saturday
Mostly sunny, with a high near 52.
Saturday Night
Mostly clear, with a low around 35.
Sunday
Sunny, with a high near 62.
Sunday Night
Mostly clear, with a low around 39.
Monday
Sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Hartwick IA
 41.81°N 92.37°W
Last Update:
12:32 pm CST Mar 3, 2026
Forecast Valid:
2pm CST Mar 3, 2026-6pm CDT Mar 9, 2026
 
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Additional Resources

Radar & Satellite Image

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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