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.

A Few Clouds

57°F

14°C

Humidity 59%
Wind Speed Calm
Barometer 30.22 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 4 Oct 7:35 pm CDT
Extended Forecast for

Castalia IA

  • Tonight

    Tonight: Mostly clear, with a low around 44. Light northwest wind.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 66. Calm wind.

    High: 66 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 50. Calm wind becoming south 5 to 8 mph in the evening.

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 71. South wind 10 to 15 mph.

    High: 71 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 52. Southwest wind around 5 mph becoming light and variable after midnight.

    Low: 52 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 70. Calm wind becoming northwest 5 to 7 mph in the afternoon.

    High: 70 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 47. Light west wind.

    Low: 47 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 66. Calm wind becoming west around 5 mph.

    High: 66 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 48. Calm wind.

    Low: 48 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 44. Light northwest wind.
Monday
Sunny, with a high near 66. Calm wind.
Monday Night
Mostly clear, with a low around 50. Calm wind becoming south 5 to 8 mph in the evening.
Tuesday
Sunny, with a high near 71. South wind 10 to 15 mph.
Tuesday Night
Mostly clear, with a low around 52. Southwest wind around 5 mph becoming light and variable after midnight.
Wednesday
Sunny, with a high near 70. Calm wind becoming northwest 5 to 7 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 47. Light west wind.
Thursday
Mostly sunny, with a high near 66. Calm wind becoming west around 5 mph.
Thursday Night
Partly cloudy, with a low around 48. Calm wind.
Friday
Mostly sunny, with a high near 66. Light south wind.
Friday Night
Mostly clear, with a low around 50. Calm wind becoming southeast around 6 mph after midnight.
Saturday
Sunny, with a high near 71. Breezy, with a south wind 8 to 17 mph.
Saturday Night
Mostly clear, with a low around 57. South wind 10 to 14 mph, with gusts as high as 23 mph.
Sunday
Mostly sunny, with a high near 72. South wind 10 to 14 mph, with gusts as high as 22 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:
3:31 pm CDT Oct 4, 2026
Forecast Valid:
7pm CDT Oct 4, 2026-6pm CDT Oct 11, 2026
 
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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