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

Decorah (KDEH)

Lat: 43.28°NLon: 91.73°WElev: 1158ft.

Fair

34°F

1°C

Humidity 93%
Wind Speed NW 5 mph
Barometer 30.13 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 9 Jan 5:35 pm CST
Extended Forecast for

Castalia IA

  • Tonight

    Tonight: A chance of flurries between 2am and 3am, then a chance of snow after 3am. Increasing clouds, with a low around 25. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 40%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 25 °F

    Mostly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: A slight chance of snow before noon, then a chance of flurries between noon and 2pm, then a slight chance of snow after 2pm. Cloudy through mid morning, then becoming mostly sunny, with a high near 30. Blustery, with a northwest wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 20%.

    High: 30 °F

    Slight Chance
    Snow and
    Blustery

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 15. Blustery, with a northwest wind 14 to 18 mph, with gusts as high as 26 mph.

    Low: 15 °F

    Mostly Cloudy
    and Blustery

  • Sunday

    Sunday: Mostly sunny, with a high near 26. Northwest wind 8 to 14 mph becoming southwest in the afternoon.

    High: 26 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 22 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 40. West wind around 9 mph.

    High: 40 °F

    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 31 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of rain after noon. Partly sunny, with a high near 44. West wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 44 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Tuesday Night

    Tuesday Night: A slight chance of rain and snow after midnight. Mostly cloudy, with a low around 24. Northwest wind 11 to 14 mph. Chance of precipitation is 20%.

    Low: 24 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

Detailed Forecast

Tonight
A chance of flurries between 2am and 3am, then a chance of snow after 3am. Increasing clouds, with a low around 25. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 40%. Total nighttime snow accumulation of less than a half inch possible.
Saturday
A slight chance of snow before noon, then a chance of flurries between noon and 2pm, then a slight chance of snow after 2pm. Cloudy through mid morning, then becoming mostly sunny, with a high near 30. Blustery, with a northwest wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 20%.
Saturday Night
Mostly cloudy, with a low around 15. Blustery, with a northwest wind 14 to 18 mph, with gusts as high as 26 mph.
Sunday
Mostly sunny, with a high near 26. Northwest wind 8 to 14 mph becoming southwest in the afternoon.
Sunday Night
Partly cloudy, with a low around 22. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 40. West wind around 9 mph.
Monday Night
Mostly cloudy, with a low around 31. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Tuesday
A 20 percent chance of rain after noon. Partly sunny, with a high near 44. West wind 10 to 14 mph, with gusts as high as 22 mph.
Tuesday Night
A slight chance of rain and snow after midnight. Mostly cloudy, with a low around 24. Northwest wind 11 to 14 mph. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 28. North wind 11 to 14 mph.
Wednesday Night
Mostly cloudy, with a low around 15. North wind 6 to 10 mph.
Thursday
A 20 percent chance of snow. Mostly sunny, with a high near 28. Northwest wind 7 to 10 mph becoming south in the afternoon.
Thursday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 22. South wind around 10 mph.
Friday
A 30 percent chance of snow. Mostly cloudy, with a high near 29. West wind around 11 mph, with gusts as high as 20 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castalia IA
 43.13°N 91.68°W
Last Update:
4:41 pm CST Jan 9, 2026
Forecast Valid:
5pm CST Jan 9, 2026-6pm CST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation