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

Heavy Rainfall Threat Continues in the Southwest on Monday; Record Warmth in the Plains and Midwest

Remnant moisture from Tropical Storm Rachel will persist over portions of the Great Basin and Southwest on Monday, bringing a potential heavy to excessive rainfall risk. Well above average and potentially record breaking temperatures will develop across the Plains and Midwest early this week, spreading into the Lower Mississippi Valley and Southeast midweek. Read More >

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Fair

85°F

29°C

Humidity 49%
Wind Speed S 17 G 23 mph
Barometer 29.71 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 12 Oct 2:55 pm CDT
Extended Forecast for

Grinnell IA

  • Columbus Day

    Columbus Day: Sunny, with a high near 86. Breezy, with a south southwest wind around 17 mph, with gusts as high as 26 mph.

    High: 86 °F

    Sunny and
    Breezy

  • Tonight

    Tonight: Clear, with a low around 61. South southwest wind 7 to 11 mph becoming west northwest after midnight. Winds could gust as high as 22 mph.

    Low: 61 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77. North wind around 6 mph becoming calm in the afternoon.

    High: 77 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely before 3am, then a slight chance of showers between 3am and 4am. Increasing clouds, with a low around 56. North wind 5 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 56 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 68. North wind around 8 mph.

    High: 68 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 53. New precipitation amounts of less than a tenth of an inch possible.

    Low: 53 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: Showers. High near 65. Chance of precipitation is 90%.

    High: 65 °F

    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 45. Breezy.

    Low: 45 °F

    Slight Chance
    Showers and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 57. Breezy.

    High: 57 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

Columbus Day
Sunny, with a high near 86. Breezy, with a south southwest wind around 17 mph, with gusts as high as 26 mph.
Tonight
Clear, with a low around 61. South southwest wind 7 to 11 mph becoming west northwest after midnight. Winds could gust as high as 22 mph.
Tuesday
Sunny, with a high near 77. North wind around 6 mph becoming calm in the afternoon.
Tuesday Night
Showers and thunderstorms likely before 3am, then a slight chance of showers between 3am and 4am. Increasing clouds, with a low around 56. North wind 5 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Mostly cloudy, with a high near 68. North wind around 8 mph.
Wednesday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 53. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Showers. High near 65. Chance of precipitation is 90%.
Thursday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 45. Breezy.
Friday
Mostly sunny, with a high near 57. Breezy.
Friday Night
Mostly clear, with a low around 33.
Saturday
Sunny, with a high near 58.
Saturday Night
Mostly clear, with a low around 40.
Sunday
Mostly sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grinnell IA
 41.75°N 92.72°W
Last Update:
1:26 pm CDT Oct 12, 2026
Forecast Valid:
3pm CDT Oct 12, 2026-6pm CDT Oct 18, 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