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

39°F

4°C

Humidity 100%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 8 Nov 11:55 pm CST
Extended Forecast for

Castalia IA

  • Overnight

    Overnight: Partly cloudy, with a low around 36. Light and variable wind.

    Low: 36 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 60. Light south wind increasing to 8 to 13 mph in the morning. Winds could gust as high as 23 mph.

    High: 60 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37. West wind 5 to 7 mph becoming calm after midnight.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 58. Calm wind.

    High: 58 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Mostly Cloudy

  • Veterans Day

    Veterans Day: A 30 percent chance of showers before noon. Partly sunny, with a high near 51. Calm wind becoming north 5 to 8 mph in the morning.

    High: 51 °F

    Chance
    Showers then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 33. North wind 7 to 9 mph.

    Low: 33 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 40. North wind 8 to 13 mph.

    High: 40 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 24. North wind 3 to 7 mph.

    Low: 24 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 36. Light and variable wind.
Monday
Partly sunny, with a high near 60. Light south wind increasing to 8 to 13 mph in the morning. Winds could gust as high as 23 mph.
Monday Night
Mostly clear, with a low around 37. West wind 5 to 7 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 58. Calm wind.
Tuesday Night
Mostly cloudy, with a low around 40. Calm wind.
Veterans Day
A 30 percent chance of showers before noon. Partly sunny, with a high near 51. Calm wind becoming north 5 to 8 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 33. North wind 7 to 9 mph.
Thursday
Partly sunny, with a high near 40. North wind 8 to 13 mph.
Thursday Night
Partly cloudy, with a low around 24. North wind 3 to 7 mph.
Friday
Sunny, with a high near 39. North wind around 5 mph becoming calm in the afternoon.
Friday Night
Mostly clear, with a low around 27. Calm wind.
Saturday
Sunny, with a high near 41. Light and variable wind.
Saturday Night
Partly cloudy, with a low around 34. Calm wind.
Sunday
Mostly sunny, with a high near 47. Calm wind becoming southwest around 5 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:
11:56 pm CST Nov 8, 2026
Forecast Valid:
12am CST Nov 9, 2026-6pm CST Nov 15, 2026
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation