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

83°F

28°C

Humidity 76%
Wind Speed Calm
Barometer 30.13 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 28 Jul 1:15 pm CDT
Extended Forecast for

Sully IA

Extreme Heat Warning until July 28, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning until July 28, 08:00pm

    NOW until 8:00pm Mon

    Extreme Heat Warning

  • This Afternoon

    High: 92 °F

    Sunny

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 73. South southeast wind around 5 mph becoming light and variable.

    Low: 73 °F

    Mostly Clear
    then Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 92. Heat index values as high as 105. South wind 5 to 7 mph becoming northwest in the afternoon.

    High: 92 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 69. East northeast wind around 6 mph. New rainfall amounts between a quarter and half of an inch possible.

    Low: 69 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms likely before 10am, then showers likely and possibly a thunderstorm after 10am. Mostly cloudy, with a high near 77. Northeast wind 6 to 9 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 77 °F

    T-storms
    Likely then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 30%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 61 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
Sunny, with a high near 92. Heat index values as high as 109. West southwest wind around 5 mph becoming light and variable.
Tonight
A 40 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 73. South southeast wind around 5 mph becoming light and variable.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 92. Heat index values as high as 105. South wind 5 to 7 mph becoming northwest in the afternoon.
Tuesday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 69. East northeast wind around 6 mph. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Showers and thunderstorms likely before 10am, then showers likely and possibly a thunderstorm after 10am. Mostly cloudy, with a high near 77. Northeast wind 6 to 9 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 30%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
Mostly sunny, with a high near 77.
Thursday Night
Partly cloudy, with a low around 57.
Friday
Mostly sunny, with a high near 75.
Friday Night
Partly cloudy, with a low around 57.
Saturday
Mostly sunny, with a high near 73.
Saturday Night
Partly cloudy, with a low around 57.
Sunday
Mostly sunny, with a high near 76.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sully IA
 41.58°N 92.84°W
Last Update:
12:36 pm CDT Jul 28, 2025
Forecast Valid:
1pm CDT Jul 28, 2025-6pm CDT Aug 3, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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