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

Heavy Rainfall and Severe Thunderstorm Threats for the Plains and Southeast

A frontal boundary extending from the western High Plains to the Southeast will focus additional showers and thunderstorms this weekend. Some of these storms may become severe, alongside frequent lightning, and isolated instances of flash flooding. Meanwhile dry conditions will continue for the Great Basin where fire weather concerns linger. For the mid-Atlantic and Northeast, seasonable weather. Read More >

Hazardous Weather Conditions

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Fair

72°F

22°C

Humidity 53%
Wind Speed E 12 mph
Barometer 30.40 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 1 Aug 3:35 pm CDT
Extended Forecast for

Grinnell IA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 76. East northeast wind around 8 mph.

    High: 76 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 55. East northeast wind 5 to 7 mph becoming calm in the evening.

    Low: 55 °F

    Partly Cloudy

  • Saturday

    Saturday: Areas of smoke. Mostly sunny, with a high near 75. Calm wind becoming east southeast around 6 mph.

    High: 75 °F

    Areas Smoke

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 75. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 75 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 76. East northeast wind around 8 mph.
Tonight
Partly cloudy, with a low around 55. East northeast wind 5 to 7 mph becoming calm in the evening.
Saturday
Areas of smoke. Mostly sunny, with a high near 75. Calm wind becoming east southeast around 6 mph.
Saturday Night
Partly cloudy, with a low around 54. Calm wind.
Sunday
Mostly sunny, with a high near 75. Calm wind becoming southeast around 6 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 55.
Monday
Mostly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 60.
Tuesday
Mostly sunny, with a high near 80.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
Mostly sunny, with a high near 83.
Wednesday Night
Partly cloudy, with a low around 67.
Thursday
Mostly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.75°N 92.72°W
Last Update:
2:34 pm CDT Aug 1, 2025
Forecast Valid:
3pm CDT Aug 1, 2025-6pm CDT Aug 7, 2025
 
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