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

45°F

7°C

Humidity 49%
Wind Speed Vrbl 3 mph
Barometer 30.20 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 5 Nov 7:15 pm CST
Extended Forecast for

Castalia IA

  • Tonight

    Tonight: Mostly clear, with a low around 31. Northwest wind around 6 mph becoming calm in the evening.

    Low: 31 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly cloudy, with a high near 54. Breezy, with a light southeast wind becoming south 12 to 17 mph in the morning. Winds could gust as high as 31 mph.

    High: 54 °F

    Partly Sunny
    then Mostly
    Cloudy and
    Breezy

  • Thursday Night

    Thursday Night: A 30 percent chance of rain before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 42. South wind 8 to 14 mph becoming west after midnight. Winds could gust as high as 23 mph.

    Low: 42 °F

    Chance Rain
    then Mostly
    Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 57. West wind 8 to 15 mph.

    High: 57 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 31. Northwest wind 5 to 10 mph becoming light after midnight.

    Low: 31 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of rain before noon, then rain and snow likely. Mostly cloudy, with a high near 40. North wind 3 to 8 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 40 °F

    Chance Rain
    then
    Rain/Snow
    Likely

  • Saturday Night

    Saturday Night: A chance of rain and snow before midnight. Mostly cloudy, with a low around 19. Northwest wind 8 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.

    Low: 19 °F

    Chance
    Rain/Snow
    then Partly
    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 31. Northwest wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 31 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 17. Northwest wind 8 to 10 mph.

    Low: 17 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 31. Northwest wind around 6 mph becoming calm in the evening.
Thursday
Mostly cloudy, with a high near 54. Breezy, with a light southeast wind becoming south 12 to 17 mph in the morning. Winds could gust as high as 31 mph.
Thursday Night
A 30 percent chance of rain before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 42. South wind 8 to 14 mph becoming west after midnight. Winds could gust as high as 23 mph.
Friday
Mostly sunny, with a high near 57. West wind 8 to 15 mph.
Friday Night
Mostly cloudy, with a low around 31. Northwest wind 5 to 10 mph becoming light after midnight.
Saturday
A chance of rain before noon, then rain and snow likely. Mostly cloudy, with a high near 40. North wind 3 to 8 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Saturday Night
A chance of rain and snow before midnight. Mostly cloudy, with a low around 19. Northwest wind 8 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.
Sunday
Mostly sunny, with a high near 31. Northwest wind 10 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Mostly clear, with a low around 17. Northwest wind 8 to 10 mph.
Monday
Sunny, with a high near 35. Northwest wind 7 to 10 mph.
Monday Night
Partly cloudy, with a low around 22. West wind 6 to 9 mph becoming south after midnight.
Veterans Day
Partly sunny, with a high near 45. Southwest wind 9 to 15 mph.
Tuesday Night
Partly cloudy, with a low around 32. West wind around 10 mph, with gusts as high as 18 mph.
Wednesday
Sunny, with a high near 49. Northwest wind 9 to 13 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:
5:21 pm CST Nov 5, 2025
Forecast Valid:
7pm CST Nov 5, 2025-6pm CST Nov 12, 2025
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation