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

Isaias Expected To Be A Strong Hurricane Approaching The Northern Gulf Coast

Isaias is expected to strengthen and be a strong hurricane when it approaches the northern Gulf Coast on Friday. There is an increasing risk of damaging hurricane-force winds and life-threatening storm surge impacts Friday into Saturday. Isaias will bring heavy rainfall to the northern Gulf Coast and much of the Southeast U.S. Friday into the weekend. Read More >

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Fair

60°F

16°C

Humidity 58%
Wind Speed Calm
Barometer 30.01 in
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 7 Oct 8:55 pm CDT
Extended Forecast for

Grinnell IA

  • Tonight

    Tonight: Mostly clear, with a low around 51. West northwest wind 3 to 5 mph.

    Low: 51 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 73. Calm wind.

    High: 73 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms, mainly after midnight. Increasing clouds, with a low around 55. Calm wind becoming east southeast around 6 mph after midnight. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 55 °F

    Chance
    T-storms

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy through mid morning, then gradual clearing, with a high near 79. Southeast wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 79 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Clear, with a low around 62. South wind around 9 mph, with gusts as high as 18 mph.

    Low: 62 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 51. West northwest wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 73. Calm wind.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly after midnight. Increasing clouds, with a low around 55. Calm wind becoming east southeast around 6 mph after midnight. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy through mid morning, then gradual clearing, with a high near 79. Southeast wind 7 to 11 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 62. South wind around 9 mph, with gusts as high as 18 mph.
Saturday
Sunny, with a high near 81.
Saturday Night
Mostly clear, with a low around 58.
Sunday
Sunny, with a high near 78.
Sunday Night
Mostly clear, with a low around 60.
Columbus Day
Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 48.
Tuesday
Mostly sunny, with a high near 62.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
A 40 percent chance of showers. Mostly sunny, with a high near 61.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.73°N 92.75°W
Last Update:
5:51 pm CDT Oct 7, 2026
Forecast Valid:
9pm CDT Oct 7, 2026-6pm CDT Oct 14, 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