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

56°F

13°C

Humidity 48%
Wind Speed SE 14 mph
Barometer 29.98 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 20 Apr 9:35 pm CDT
Extended Forecast for

Sully IA

  • Tonight

    Tonight: Increasing clouds, with a low around 52. South southwest wind around 14 mph, with gusts as high as 24 mph.

    Low: 52 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 79. West southwest wind 10 to 14 mph, with gusts as high as 23 mph.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 54. West wind around 6 mph becoming north northwest in the evening.

    Low: 54 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78. South wind 6 to 14 mph, with gusts as high as 20 mph.

    High: 78 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 59. South wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 59 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 75. Windy. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Windy. Mostly
    Cloudy then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 50. Breezy. Chance of precipitation is 80%.

    Low: 50 °F

    Showers and
    Breezy

  • Friday

    Friday: A slight chance of showers and thunderstorms. Partly sunny, with a high near 64. Chance of precipitation is 20%.

    High: 64 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 52. South southwest wind around 14 mph, with gusts as high as 24 mph.
Tuesday
Sunny, with a high near 79. West southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly clear, with a low around 54. West wind around 6 mph becoming north northwest in the evening.
Wednesday
Sunny, with a high near 78. South wind 6 to 14 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 59. South wind 10 to 13 mph, with gusts as high as 21 mph.
Thursday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 75. Windy. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 50. Breezy. Chance of precipitation is 80%.
Friday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 64. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 42.
Saturday
Mostly sunny, with a high near 61.
Saturday Night
Mostly cloudy, with a low around 41.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 60.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 43.
Monday
A 30 percent chance of showers. Mostly cloudy, with a high near 58.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sully IA
 41.58°N 92.84°W
Last Update:
5:43 pm CDT Apr 20, 2026
Forecast Valid:
9pm CDT Apr 20, 2026-6pm CDT Apr 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