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

Tropical Moisture Will Bring Heavy to Excessive Rainfall with Possible Flooding This Week

Tropical moisture from the remnants of Odalys and Hurricane Polo will surge over the southwest into the central U.S. this week with several days of heavy to excessive rainfall which may bring limited to considerable flooding. Flood Watches have been issued through Wednesday in the southwest U.S. and moderate risk outlooks have been issued today through Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Grinnell Municipal Airfield (KGGI)

Lat: 41.71°NLon: 92.73°WElev: 1007ft.

Partly Cloudy

75°F

24°C

Humidity 50%
Wind Speed Calm
Barometer 30.09 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 28 Sep 1:55 pm CDT
Extended Forecast for

Montezuma IA

Flood Watch September 29, 07:00pm until October 2, 01:00am
Click here for hazard details and duration
Flood Watch

  • This Afternoon

    This Afternoon: Sunny, with a high near 71. Light east southeast wind.

    High: 71 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 55. Calm wind becoming southeast around 5 mph after midnight.

    Low: 55 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 74. South wind 5 to 9 mph.

    High: 74 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Showers likely, mainly after 4am. Increasing clouds, with a low around 63. South wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 63 °F

    Mostly Cloudy
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 70. South wind 7 to 9 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 70 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 63. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    Low: 63 °F

    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. High near 66. Chance of precipitation is 80%.

    High: 66 °F

    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 71. Light east southeast wind.
Tonight
Partly cloudy, with a low around 55. Calm wind becoming southeast around 5 mph after midnight.
Tuesday
Mostly sunny, with a high near 74. South wind 5 to 9 mph.
Tuesday Night
Showers likely, mainly after 4am. Increasing clouds, with a low around 63. South wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Showers and possibly a thunderstorm. High near 70. South wind 7 to 9 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday Night
Showers and possibly a thunderstorm. Low around 63. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Thursday
Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. High near 66. Chance of precipitation is 80%.
Thursday Night
A 40 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 51.
Friday
Mostly sunny, with a high near 63.
Friday Night
Partly cloudy, with a low around 48.
Saturday
Mostly sunny, with a high near 63.
Saturday Night
Mostly cloudy, with a low around 50.
Sunday
Mostly sunny, with a high near 62.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Montezuma IA
 41.57°N 92.52°W
Last Update:
1:47 pm CDT Sep 28, 2026
Forecast Valid:
2pm CDT Sep 28, 2026-6pm CDT Oct 4, 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