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

19°C

67°F

Humidity 86%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 17°C (62°F)
Visibility 16 km
Last update 12 Jul 10:15 pm CDT
Extended Forecast for

Grinnell IA

  • Tonight

    Tonight: Mostly cloudy, with a low around 16. Calm wind.

    Low: 16 °C

    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 28. Light west southwest wind becoming southwest 6 to 11 km/h in the morning.

    High: 28 °C

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 18. South southwest wind 5 to 8 km/h.

    Low: 18 °C

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 31. South southwest wind 5 to 10 km/h.

    High: 31 °C

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 19. South wind 5 to 8 km/h.

    Low: 19 °C

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 30.

    High: 30 °C

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers, with thunderstorms also possible after 1am. Partly cloudy, with a low around 21. Chance of precipitation is 40%.

    Low: 21 °C

    Chance
    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 29.

    High: 29 °C

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 19.

    Low: 19 °C

    Chance
    T-storms

Detailed Forecast

Tonight
Mostly cloudy, with a low around 16. Calm wind.
Sunday
Sunny, with a high near 28. Light west southwest wind becoming southwest 6 to 11 km/h in the morning.
Sunday Night
Mostly clear, with a low around 18. South southwest wind 5 to 8 km/h.
Monday
Sunny, with a high near 31. South southwest wind 5 to 10 km/h.
Monday Night
Mostly clear, with a low around 19. South wind 5 to 8 km/h.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 30.
Tuesday Night
A chance of showers, with thunderstorms also possible after 1am. Partly cloudy, with a low around 21. Chance of precipitation is 40%.
Wednesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 29.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 19.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 26.
Thursday Night
Mostly cloudy, with a low around 17.
Friday
Partly sunny, with a high near 26.
Friday Night
Partly cloudy, with a low around 17.
Saturday
Mostly sunny, with a high near 27.
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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:
10:23 pm CDT Jul 12, 2025
Forecast Valid:
10pm CDT Jul 12, 2025-6pm CDT Jul 19, 2025
 
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