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

54°F

12°C

Humidity 44%
Wind Speed Calm
Barometer 29.87 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 15 Feb 5:35 pm CST
Extended Forecast for

Castalia IA

  • Tonight

    Tonight: Partly cloudy, with a low around 38. Light southwest wind increasing to 8 to 13 mph in the evening.

    Low: 38 °F

    Partly Cloudy

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 57. Southwest wind 6 to 11 mph becoming light and variable in the afternoon. Winds could gust as high as 20 mph.

    High: 57 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 37. Calm wind becoming east 5 to 7 mph in the evening.

    Low: 37 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 55. Breezy, with a southeast wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 55 °F

    Mostly Cloudy
    then Partly
    Sunny and
    Breezy

  • Tuesday Night

    Tuesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 43. Breezy, with a southeast wind 14 to 17 mph becoming southwest after midnight. Winds could gust as high as 25 mph. New precipitation amounts of less than a tenth of an inch possible.

    Low: 43 °F

    Chance Rain
    and Breezy

  • Wednesday

    Wednesday: A 20 percent chance of rain before noon. Sunny, with a high near 53. Breezy, with a west wind 14 to 20 mph, with gusts as high as 28 mph.

    High: 53 °F

    Breezy.
    Slight Chance
    Rain then
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 30. West wind 7 to 13 mph becoming north after midnight.

    Low: 30 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain after noon. Mostly sunny, with a high near 45. Northeast wind 7 to 13 mph, with gusts as high as 21 mph.

    High: 45 °F

    Mostly Sunny
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A chance of rain and snow before midnight, then a chance of snow. Mostly cloudy, with a low around 24. Northeast wind 11 to 13 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 50%.

    Low: 24 °F

    Chance
    Rain/Snow
    then Chance
    Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 38. Light southwest wind increasing to 8 to 13 mph in the evening.
Washington's Birthday
Mostly sunny, with a high near 57. Southwest wind 6 to 11 mph becoming light and variable in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Increasing clouds, with a low around 37. Calm wind becoming east 5 to 7 mph in the evening.
Tuesday
Mostly cloudy, with a high near 55. Breezy, with a southeast wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph.
Tuesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 43. Breezy, with a southeast wind 14 to 17 mph becoming southwest after midnight. Winds could gust as high as 25 mph. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
A 20 percent chance of rain before noon. Sunny, with a high near 53. Breezy, with a west wind 14 to 20 mph, with gusts as high as 28 mph.
Wednesday Night
Partly cloudy, with a low around 30. West wind 7 to 13 mph becoming north after midnight.
Thursday
A 30 percent chance of rain after noon. Mostly sunny, with a high near 45. Northeast wind 7 to 13 mph, with gusts as high as 21 mph.
Thursday Night
A chance of rain and snow before midnight, then a chance of snow. Mostly cloudy, with a low around 24. Northeast wind 11 to 13 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 50%.
Friday
A 20 percent chance of snow. Partly sunny, with a high near 33. West wind 11 to 14 mph.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 19. Northwest wind 8 to 11 mph.
Saturday
A 30 percent chance of snow. Mostly sunny, with a high near 33. Northwest wind 8 to 10 mph.
Saturday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 14. Northwest wind around 9 mph.
Sunday
Mostly sunny, with a high near 30. Northwest wind 8 to 11 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:
5:16 pm CST Feb 15, 2026
Forecast Valid:
5pm CST Feb 15, 2026-6pm CST Feb 22, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation