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.

Fog/Mist

75°F

24°C

Humidity 97%
Wind Speed Calm
Barometer 29.90 in
Dewpoint 74°F (23°C)
Visibility 2.50 mi
Last update 26 Jul 4:35 am CDT
Extended Forecast for

Grinnell IA

Extreme Heat Watch July 26, 09:00pm until July 27, 10:00pm
Extreme Heat Warning July 26, 12:00pm until July 26, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch
Extreme Heat Warning

  • Overnight

    Overnight: A 20 percent chance of showers. Mostly cloudy, with a steady temperature around 75. Light south wind.

    Low: 75 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers before 9am. Partly sunny, with a high near 95. Heat index values as high as 114. South southeast wind 5 to 8 mph becoming west in the morning.

    High: 95 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 76. South southwest wind 7 to 9 mph.

    Low: 76 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 95. Heat index values as high as 109. Southwest wind around 8 mph.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 71. North northwest wind 5 to 7 mph.

    Low: 71 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers. Mostly cloudy, with a steady temperature around 75. Light south wind.
Sunday
A 20 percent chance of showers before 9am. Partly sunny, with a high near 95. Heat index values as high as 114. South southeast wind 5 to 8 mph becoming west in the morning.
Sunday Night
Partly cloudy, with a low around 76. South southwest wind 7 to 9 mph.
Monday
Sunny, with a high near 95. Heat index values as high as 109. Southwest wind around 8 mph.
Monday Night
Mostly clear, with a low around 71. North northwest wind 5 to 7 mph.
Tuesday
Mostly sunny, with a high near 89.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Mostly sunny, with a high near 88.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 66.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 64.
Saturday
Sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.75°N 92.72°W
Last Update:
1:56 am CDT Jul 26, 2026
Forecast Valid:
4am CDT Jul 26, 2026-6pm CDT Aug 1, 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