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

5°F

-15°C

Humidity 72%
Wind Speed Calm
Barometer 30.33 in
Dewpoint -2°F (-19°C)
Visibility 10.00 mi
Last update 7 Dec 6:55 pm CST
Extended Forecast for

Castalia IA

  • Tonight

    Tonight: A chance of flurries after 3am. Increasing clouds, with a temperature falling to near -1 by 9pm, then rising to around 6 during the remainder of the night. Light and variable wind.

    Low: -1 °F⇑

    Chance
    Flurries

  • Monday

    Monday: A chance of flurries before 11am. Mostly cloudy, with a high near 20. Wind chill values as low as -1. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 18 mph.

    High: 20 °F

    Chance
    Flurries

  • Monday Night

    Monday Night: Mostly cloudy, with a temperature rising to around 26 by 5am. South wind 9 to 14 mph becoming west after midnight. Winds could gust as high as 22 mph.

    Low: 15 °F⇑

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of rain and snow between noon and 3pm, then a chance of rain after 3pm. Mostly cloudy, with a high near 36. West wind 8 to 13 mph becoming south in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 30%.

    High: 36 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain likely before 3am, then a chance of snow. Cloudy, with a low around 22. Breezy, with a south wind 14 to 20 mph becoming northwest after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    Low: 22 °F

    Breezy. Rain
    Likely then
    Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 27. Blustery, with a northwest wind 10 to 20 mph, with gusts as high as 29 mph.

    High: 27 °F

    Slight Chance
    Snow and
    Blustery then
    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 6. Northwest wind 5 to 9 mph.

    Low: 6 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: A 40 percent chance of snow. Partly sunny, with a high near 18. North wind 6 to 9 mph.

    High: 18 °F

    Chance Snow

  • Thursday Night

    Thursday Night: A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 0. Northwest wind 9 to 11 mph.

    Low: 0 °F

    Chance Snow

Detailed Forecast

Tonight
A chance of flurries after 3am. Increasing clouds, with a temperature falling to near -1 by 9pm, then rising to around 6 during the remainder of the night. Light and variable wind.
Monday
A chance of flurries before 11am. Mostly cloudy, with a high near 20. Wind chill values as low as -1. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
Monday Night
Mostly cloudy, with a temperature rising to around 26 by 5am. South wind 9 to 14 mph becoming west after midnight. Winds could gust as high as 22 mph.
Tuesday
A chance of rain and snow between noon and 3pm, then a chance of rain after 3pm. Mostly cloudy, with a high near 36. West wind 8 to 13 mph becoming south in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 30%.
Tuesday Night
Rain likely before 3am, then a chance of snow. Cloudy, with a low around 22. Breezy, with a south wind 14 to 20 mph becoming northwest after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Wednesday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 27. Blustery, with a northwest wind 10 to 20 mph, with gusts as high as 29 mph.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 6. Northwest wind 5 to 9 mph.
Thursday
A 40 percent chance of snow. Partly sunny, with a high near 18. North wind 6 to 9 mph.
Thursday Night
A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 0. Northwest wind 9 to 11 mph.
Friday
Partly sunny, with a high near 8. Northwest wind 11 to 15 mph, with gusts as high as 24 mph.
Friday Night
Mostly cloudy, with a low around -8. Northwest wind 10 to 14 mph, with gusts as high as 22 mph.
Saturday
Partly sunny and cold, with a high near 2. Northwest wind 8 to 10 mph.
Saturday Night
A 20 percent chance of snow. Mostly cloudy, with a low around -7. West wind around 7 mph.
Sunday
Mostly sunny, with a high near 10. Southwest wind 7 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castalia IA
 43.1°N 91.68°W
Last Update:
6:16 pm CST Dec 7, 2025
Forecast Valid:
7pm CST Dec 7, 2025-6pm CST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation