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

Heavy Rainfall in the Southern Plains and Mississippi Valley; Thunderstorms in Eastern Colorado on Thursday

A multiple day heavy rainfall event will begin to set up from the Southern Plains into the Mississippi Valley Thursday, peaking in intensity over the holiday weekend. Widely scattered thunderstorms are expected to develop across eastern Colorado Thursday afternoon and evening. Large hail will be the primary hazard. Read More >

Current conditions at

Ottumwa Regional Airport (KOTM)

Lat: 41.1°NLon: 92.44°WElev: 830ft.

Fair

55°F

13°C

Humidity 72%
Wind Speed NE 6 mph
Barometer 30.20 in (1022.8 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 20 May 10:53 pm CDT
Extended Forecast for

Delta IA

  • Tonight

    Tonight: Increasing clouds, with a low around 44. East wind 5 to 10 mph.

    Low: 44 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy, with a high near 66. East wind around 10 mph, with gusts as high as 20 mph.

    High: 66 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 48. East wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 48 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely. Mostly cloudy, with a high near 64. East wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 64 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 50.

    Low: 50 °F

    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 75.

    High: 75 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 44. East wind 5 to 10 mph.
Thursday
Mostly cloudy, with a high near 66. East wind around 10 mph, with gusts as high as 20 mph.
Thursday Night
A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 48. East wind 10 to 15 mph, with gusts as high as 20 mph.
Friday
Showers likely. Mostly cloudy, with a high near 64. East wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 50.
Saturday
Partly sunny, with a high near 75.
Saturday Night
Partly cloudy, with a low around 52.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Mostly clear, with a low around 54.
Memorial Day
Mostly sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Delta IA
 41.33°N 92.32°W (Elev. 840 ft)
Last Update:
8:56 pm CDT May 20, 2026
Forecast Valid:
11pm CDT May 20, 2026-6pm CDT May 27, 2026
 
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Additional Resources

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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