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

Hazardous Weather Conditions

Current conditions at

Decorah (KDEH)

Lat: 43.28°NLon: 91.73°WElev: 1158ft.

Overcast

27°F

-3°C

Humidity 100%
Wind Speed Vrbl 5 mph
Barometer 29.71 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 5 Dec 6:55 pm CST
Extended Forecast for

Castalia IA

Winter Weather Advisory December 6, 03:00pm until December 7, 06:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: A 30 percent chance of snow, mainly before 8pm. Mostly cloudy, with a low around 13. Northwest wind 6 to 9 mph, with gusts as high as 23 mph.

    Low: 13 °F

    Chance Snow
    then Mostly
    Cloudy

  • Saturday

    Saturday: A 50 percent chance of snow after 5pm. Partly sunny, with a high near 20. Light and variable wind becoming east around 6 mph in the afternoon. New snow accumulation of less than a half inch possible.

    High: 20 °F

    Partly Sunny
    then Chance
    Snow

  • Saturday Night

    Saturday Night: Snow. The snow could be heavy at times. Low around 9. Wind chill values as low as zero. Northeast wind 3 to 8 mph. Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.

    Low: 9 °F

    Heavy Snow

  • Sunday

    Sunday: Mostly sunny, with a high near 14. Wind chill values as low as -2. North wind 6 to 8 mph.

    High: 14 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around -3. North wind around 5 mph becoming calm in the evening.

    Low: -3 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 19. Light south wind increasing to 5 to 10 mph in the morning.

    High: 19 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 11. South wind 9 to 11 mph becoming west after midnight. Winds could gust as high as 20 mph.

    Low: 11 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain and snow after noon. Mostly cloudy, with a high near 34. West wind 8 to 11 mph becoming south in the afternoon. Chance of precipitation is 20%.

    High: 34 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain and snow likely, mainly before midnight. Cloudy, with a low around 22. South wind 11 to 15 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 60%.

    Low: 22 °F

    Rain/Snow
    Likely

Detailed Forecast

Tonight
A 30 percent chance of snow, mainly before 8pm. Mostly cloudy, with a low around 13. Northwest wind 6 to 9 mph, with gusts as high as 23 mph.
Saturday
A 50 percent chance of snow after 5pm. Partly sunny, with a high near 20. Light and variable wind becoming east around 6 mph in the afternoon. New snow accumulation of less than a half inch possible.
Saturday Night
Snow. The snow could be heavy at times. Low around 9. Wind chill values as low as zero. Northeast wind 3 to 8 mph. Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.
Sunday
Mostly sunny, with a high near 14. Wind chill values as low as -2. North wind 6 to 8 mph.
Sunday Night
Mostly cloudy, with a low around -3. North wind around 5 mph becoming calm in the evening.
Monday
Mostly cloudy, with a high near 19. Light south wind increasing to 5 to 10 mph in the morning.
Monday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 11. South wind 9 to 11 mph becoming west after midnight. Winds could gust as high as 20 mph.
Tuesday
A slight chance of rain and snow after noon. Mostly cloudy, with a high near 34. West wind 8 to 11 mph becoming south in the afternoon. Chance of precipitation is 20%.
Tuesday Night
Rain and snow likely, mainly before midnight. Cloudy, with a low around 22. South wind 11 to 15 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 60%.
Wednesday
A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 29. Northwest wind around 15 mph, with gusts as high as 24 mph.
Wednesday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 11. Northwest wind 8 to 13 mph.
Thursday
A 20 percent chance of snow. Mostly cloudy, with a high near 19. Northwest wind 7 to 9 mph.
Thursday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 5. Northwest wind around 8 mph.
Friday
Partly sunny, with a high near 13. Northwest wind 8 to 11 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castalia IA
 43.1°N 91.68°W
Last Update:
6:46 pm CST Dec 5, 2025
Forecast Valid:
7pm CST Dec 5, 2025-6pm CST Dec 12, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation