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

45°F

7°C

Humidity 32%
Wind Speed S 14 mph
Barometer 30.09 in
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 29 Mar 8:35 am CDT
Extended Forecast for

3 Miles NNW Hartwick IA

  • Today

    Today: Mostly sunny, with a high near 70. Breezy, with a south wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 70 °F

    Sunny then
    Partly Sunny
    and Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 45. South wind 6 to 9 mph.

    Low: 45 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 83. Breezy, with a south southwest wind 6 to 16 mph, with gusts as high as 23 mph.

    High: 83 °F

    Sunny then
    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. South southwest wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 56 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 70. Breezy, with a south southwest wind 14 to 18 mph becoming north northwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 70 °F

    Breezy.
    Slight Chance
    Showers then
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 7pm, then a chance of showers between 7pm and 1am. Mostly cloudy, with a low around 34. Breezy. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 34 °F

    Chance
    Showers and
    Breezy

  • Wednesday

    Wednesday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 48.

    High: 48 °F

    Partly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of rain showers before 1am, then a chance of rain and snow showers. Mostly cloudy, with a low around 30. Chance of precipitation is 50%.

    Low: 30 °F

    Chance
    Showers then
    Chance
    Rain/Snow

  • Thursday

    Thursday: A chance of rain and snow showers before 1pm, then rain showers likely. Mostly cloudy, with a high near 44. Chance of precipitation is 60%.

    High: 44 °F

    Rain/Snow
    Likely

Detailed Forecast

Today
Mostly sunny, with a high near 70. Breezy, with a south wind 10 to 16 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 45. South wind 6 to 9 mph.
Monday
Sunny, with a high near 83. Breezy, with a south southwest wind 6 to 16 mph, with gusts as high as 23 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. South southwest wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 70. Breezy, with a south southwest wind 14 to 18 mph becoming north northwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
A chance of showers and thunderstorms before 7pm, then a chance of showers between 7pm and 1am. Mostly cloudy, with a low around 34. Breezy. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 48.
Wednesday Night
A chance of rain showers before 1am, then a chance of rain and snow showers. Mostly cloudy, with a low around 30. Chance of precipitation is 50%.
Thursday
A chance of rain and snow showers before 1pm, then rain showers likely. Mostly cloudy, with a high near 44. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 33.
Friday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 59.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 41. Chance of precipitation is 70%.
Saturday
A 50 percent chance of showers. Mostly cloudy, with a high near 54. Breezy.
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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:
6:27 am CDT Mar 29, 2026
Forecast Valid:
8am CDT Mar 29, 2026-6pm CDT Apr 4, 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