National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Fair

76°F

24°C

Humidity 42%
Wind Speed NW 7 mph
Barometer 29.99 in
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 20 Jun 4:55 pm CDT
Extended Forecast for

Grinnell IA

  • Tonight

    Tonight: A 50 percent chance of showers, mainly after 3am. Increasing clouds, with a low around 56. Northwest wind around 5 mph becoming calm. New precipitation amounts of less than a tenth of an inch possible.

    Low: 56 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers and thunderstorms before 4pm, then a chance of showers. High near 66. Breezy, with an east wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 66 °F

    Showers and
    Breezy

  • Sunday Night

    Sunday Night: A 10 percent chance of showers before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 53. Breezy, with a northeast wind 8 to 18 mph, with gusts as high as 26 mph.

    Low: 53 °F

    Slight Chance
    Showers and
    Breezy then
    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 76. Northeast wind 5 to 7 mph.

    High: 76 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. Light east northeast wind.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 57.

    Low: 57 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Tonight
A 50 percent chance of showers, mainly after 3am. Increasing clouds, with a low around 56. Northwest wind around 5 mph becoming calm. New precipitation amounts of less than a tenth of an inch possible.
Sunday
Showers and thunderstorms before 4pm, then a chance of showers. High near 66. Breezy, with an east wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Sunday Night
A 10 percent chance of showers before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 53. Breezy, with a northeast wind 8 to 18 mph, with gusts as high as 26 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 76. Northeast wind 5 to 7 mph.
Monday Night
Mostly clear, with a low around 54. Light east northeast wind.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 57.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
Mostly sunny, with a high near 77.
Thursday Night
Mostly clear, with a low around 55.
Friday
Mostly sunny, with a high near 80.
Friday Night
A 30 percent chance of showers. Partly cloudy, with a low around 60.
Saturday
A 30 percent chance of showers. Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.75°N 92.72°W
Last Update:
2:44 pm CDT Jun 20, 2026
Forecast Valid:
5pm CDT Jun 20, 2026-6pm CDT Jun 27, 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