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

28°F

-2°C

Humidity 93%
Wind Speed Calm
Barometer 30.33 in
Dewpoint 27°F (-3°C)
Visibility 9.00 mi
Last update 15 Nov 12:55 am CST
Extended Forecast for

Castalia IA

  • Overnight

    Overnight: Mostly cloudy, with a low around 24. Calm wind.

    Low: 24 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 48. Calm wind.

    High: 48 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 29. Calm wind becoming south around 5 mph after midnight.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Increasing clouds, with a high near 50. Southwest wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 50 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 35. South wind around 9 mph, with gusts as high as 18 mph.

    Low: 35 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 54. South wind 8 to 14 mph, with gusts as high as 22 mph.

    High: 54 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 39. South wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 39 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 56. Breezy, with a south wind 14 to 20 mph, with gusts as high as 28 mph.

    High: 56 °F

    Mostly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 46. Breezy, with a south wind 10 to 17 mph, with gusts as high as 28 mph.

    Low: 46 °F

    Slight Chance
    Rain and
    Breezy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 24. Calm wind.
Sunday
Mostly sunny, with a high near 48. Calm wind.
Sunday Night
Mostly clear, with a low around 29. Calm wind becoming south around 5 mph after midnight.
Monday
Increasing clouds, with a high near 50. Southwest wind 6 to 11 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 35. South wind around 9 mph, with gusts as high as 18 mph.
Tuesday
Sunny, with a high near 54. South wind 8 to 14 mph, with gusts as high as 22 mph.
Tuesday Night
Partly cloudy, with a low around 39. South wind 11 to 14 mph, with gusts as high as 23 mph.
Wednesday
Mostly sunny, with a high near 56. Breezy, with a south wind 14 to 20 mph, with gusts as high as 28 mph.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 46. Breezy, with a south wind 10 to 17 mph, with gusts as high as 28 mph.
Thursday
Mostly sunny, with a high near 56. West wind 6 to 11 mph becoming light in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 38. Calm wind.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 58. Light southeast wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
Rain. Low around 48. Breezy, with a south wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Saturday
Rain. High near 58. Breezy, with a south wind around 17 mph becoming west in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 80%.
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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:
12:51 am CST Nov 15, 2026
Forecast Valid:
1am CST Nov 15, 2026-6pm CST Nov 21, 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