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

77°F

25°C

Humidity 39%
Wind Speed S 17 mph
Barometer 29.86 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 22 Apr 5:15 pm CDT
Extended Forecast for

3 Miles NNW Hartwick IA

  • Tonight

    Tonight: Partly cloudy, with a low around 57. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 57 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 75. Breezy, with a south wind 13 to 20 mph, with gusts as high as 30 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Breezy.
    Partly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Low around 53. South wind 7 to 15 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 53 °F

    T-storms

  • Friday

    Friday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 66. Northwest wind 9 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 20%.

    High: 66 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: Clear, with a low around 41. North wind 6 to 8 mph.

    Low: 41 °F

    Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 68. Breezy.

    High: 68 °F

    Mostly Sunny
    then Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm, then showers after 1am. Low around 52. Breezy. Chance of precipitation is 80%.

    Low: 52 °F

    Showers and
    Breezy

Detailed Forecast

Tonight
Partly cloudy, with a low around 57. South wind around 10 mph, with gusts as high as 20 mph.
Thursday
A 40 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 75. Breezy, with a south wind 13 to 20 mph, with gusts as high as 30 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Low around 53. South wind 7 to 15 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Friday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 66. Northwest wind 9 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 20%.
Friday Night
Clear, with a low around 41. North wind 6 to 8 mph.
Saturday
Mostly sunny, with a high near 66.
Saturday Night
Mostly cloudy, with a low around 46.
Sunday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 68. Breezy.
Sunday Night
Showers likely and possibly a thunderstorm, then showers after 1am. Low around 52. Breezy. Chance of precipitation is 80%.
Monday
Showers. High near 66. Breezy. Chance of precipitation is 80%.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 42. Breezy.
Tuesday
Partly sunny, with a high near 60.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Mostly sunny, with a high near 61.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Hartwick IA
 41.81°N 92.37°W
Last Update:
5:22 pm CDT Apr 22, 2026
Forecast Valid:
5pm CDT Apr 22, 2026-6pm CDT Apr 29, 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