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

73°F

23°C

Humidity 76%
Wind Speed Calm
Barometer 29.96 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 14 Sep 1:15 am CDT
Extended Forecast for

Grinnell IA

  • Overnight

    Overnight: Mostly cloudy, with a low around 68. South southeast wind 3 to 6 mph.

    Low: 68 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 90. Calm wind becoming south southeast 5 to 7 mph in the afternoon.

    High: 90 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind 5 to 7 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Chance
    T-storms

  • Monday

    Monday: A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 88. South southeast wind 3 to 6 mph. Chance of precipitation is 20%.

    High: 88 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.

    High: 88 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 84. Chance of precipitation is 30%.

    High: 84 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.

    Low: 61 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Mostly cloudy, with a low around 68. South southeast wind 3 to 6 mph.
Sunday
A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 90. Calm wind becoming south southeast 5 to 7 mph in the afternoon.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind 5 to 7 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 88. South southeast wind 3 to 6 mph. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 66. Calm wind.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Tuesday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 84. Chance of precipitation is 30%.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 40%.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 58.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 76.
Friday Night
Partly cloudy, with a low around 54.
Saturday
Mostly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.75°N 92.72°W
Last Update:
10:50 pm CDT Sep 13, 2025
Forecast Valid:
1am CDT Sep 14, 2025-6pm CDT Sep 20, 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