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

59°F

15°C

Humidity 46%
Wind Speed Calm
Barometer 29.69 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 9 Mar 9:15 pm CDT
Extended Forecast for

Grinnell IA

  • Tonight

    Tonight: Mostly clear, with a low around 43. Calm wind becoming east around 5 mph after midnight.

    Low: 43 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 67. East northeast wind 6 to 9 mph.

    High: 67 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 36. North northeast wind 10 to 15 mph, with gusts as high as 24 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 36 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of rain before 1pm. Cloudy through mid morning, then gradual clearing, with a high near 46. Windy, with a north northwest wind 16 to 21 mph, with gusts as high as 29 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 46 °F

    Chance Rain
    and Windy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 26. Northwest wind 5 to 11 mph, with gusts as high as 20 mph.

    Low: 26 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, with a high near 54. Windy.

    High: 54 °F

    Mostly Sunny
    then Mostly
    Cloudy and
    Windy

  • Thursday Night

    Thursday Night: A 40 percent chance of rain, mainly before 1am. Mostly cloudy, with a low around 36. Breezy.

    Low: 36 °F

    Chance Rain
    and Breezy

  • Friday

    Friday: Mostly cloudy, with a high near 49.

    High: 49 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 43. Calm wind becoming east around 5 mph after midnight.
Tuesday
Increasing clouds, with a high near 67. East northeast wind 6 to 9 mph.
Tuesday Night
A 40 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 36. North northeast wind 10 to 15 mph, with gusts as high as 24 mph. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
A 30 percent chance of rain before 1pm. Cloudy through mid morning, then gradual clearing, with a high near 46. Windy, with a north northwest wind 16 to 21 mph, with gusts as high as 29 mph. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Mostly clear, with a low around 26. Northwest wind 5 to 11 mph, with gusts as high as 20 mph.
Thursday
Partly sunny, with a high near 54. Windy.
Thursday Night
A 40 percent chance of rain, mainly before 1am. Mostly cloudy, with a low around 36. Breezy.
Friday
Mostly cloudy, with a high near 49.
Friday Night
Mostly cloudy, with a low around 33.
Saturday
Mostly cloudy, with a high near 54.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 33. Breezy.
Sunday
A chance of rain and snow. Mostly cloudy, with a high near 41. Windy. Chance of precipitation is 40%.
Sunday Night
Mostly cloudy, with a low around 16. Windy.
Monday
Mostly sunny, with a high near 30.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.75°N 92.69°W
Last Update:
7:26 pm CDT Mar 9, 2026
Forecast Valid:
9pm CDT Mar 9, 2026-6pm CDT Mar 16, 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