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

70°F

21°C

Humidity 50%
Wind Speed Calm
Barometer 30.00 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 23 May 7:35 pm CDT
Extended Forecast for

Sully IA

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 51. West northwest wind around 6 mph becoming calm in the evening.

    Low: 51 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 80. Calm wind becoming south 5 to 9 mph in the afternoon.

    High: 80 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 56. South wind 3 to 7 mph.

    Low: 56 °F

    Mostly Clear

  • Memorial Day

    Memorial Day: Sunny, with a high near 85. South wind 5 to 11 mph, with gusts as high as 18 mph.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 61. South southeast wind 3 to 6 mph.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 60%.

    High: 80 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 50%.

    Low: 63 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 51. West northwest wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 80. Calm wind becoming south 5 to 9 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 56. South wind 3 to 7 mph.
Memorial Day
Sunny, with a high near 85. South wind 5 to 11 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 61. South southeast wind 3 to 6 mph.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 50%.
Thursday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 82.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 79.
Friday Night
Mostly cloudy, with a low around 56.
Saturday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sully IA
 41.58°N 92.84°W
Last Update:
5:52 pm CDT May 23, 2026
Forecast Valid:
7pm CDT May 23, 2026-6pm CDT May 30, 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