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

Excessive Rainfall and Tropical Storm in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce considerable, potentially life-threatening, flooding across the lower Mississippi River Valley and central Great Lakes region through tonight. Tropical Storm Arthur will move northeastward along the Texas coast today and then move inland over southwestern Louisiana by tonight. An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana. Read More >

Hazardous Weather Conditions

Current conditions at

Decorah (KDEH)

Lat: 43.28°NLon: 91.73°WElev: 1158ft.

Mostly Cloudy

70°F

21°C

Humidity 88%
Wind Speed NW 14 G 21 mph
Barometer 29.34 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 17 Jun 6:35 pm CDT
Extended Forecast for

Ossian IA

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly between 8pm and 9pm. Mostly cloudy, with a low around 54. Breezy, with a northwest wind 13 to 21 mph, with gusts as high as 32 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Chance
    T-storms and
    Breezy then
    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 71. Northwest wind 10 to 13 mph, with gusts as high as 21 mph.

    High: 71 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 51. Northwest wind 3 to 8 mph.

    Low: 51 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Juneteenth

    Juneteenth: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 74. Light northwest wind becoming west 5 to 9 mph in the morning.

    High: 74 °F

    Sunny then
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly clear, with a low around 55. West wind 5 to 7 mph. Chance of precipitation is 30%.

    Low: 55 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 76. Northwest wind 3 to 5 mph.

    High: 76 °F

    Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 57. Calm wind becoming east around 6 mph after midnight.

    Low: 57 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 70. East wind 8 to 13 mph. Chance of precipitation is 60%.

    High: 70 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 53. Northeast wind 9 to 14 mph.

    Low: 53 °F

    Chance
    Showers

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly between 8pm and 9pm. Mostly cloudy, with a low around 54. Breezy, with a northwest wind 13 to 21 mph, with gusts as high as 32 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 71. Northwest wind 10 to 13 mph, with gusts as high as 21 mph.
Thursday Night
A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 51. Northwest wind 3 to 8 mph.
Juneteenth
A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 74. Light northwest wind becoming west 5 to 9 mph in the morning.
Friday Night
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly clear, with a low around 55. West wind 5 to 7 mph. Chance of precipitation is 30%.
Saturday
Sunny, with a high near 76. Northwest wind 3 to 5 mph.
Saturday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 57. Calm wind becoming east around 6 mph after midnight.
Sunday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 70. East wind 8 to 13 mph. Chance of precipitation is 60%.
Sunday Night
A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 53. Northeast wind 9 to 14 mph.
Monday
Mostly sunny, with a high near 72. North wind around 8 mph.
Monday Night
Partly cloudy, with a low around 54. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 75. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 57. Southwest wind 3 to 5 mph.
Wednesday
Mostly sunny, with a high near 76. West wind 5 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Ossian IA
 43.15°N 91.77°W
Last Update:
6:11 pm CDT Jun 17, 2026
Forecast Valid:
6pm CDT Jun 17, 2026-6pm CDT Jun 24, 2026
 
Forecast Discussion
 
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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