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.

Mostly Cloudy

27°F

-3°C

Humidity 100%
Wind Speed Vrbl 7 G 21 mph
Barometer 30.23 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 11 Jan 6:55 pm CST
Extended Forecast for

Castalia IA

  • Tonight

    Tonight: Increasing clouds, with a low around 24. Southwest wind 8 to 15 mph, with gusts as high as 26 mph.

    Low: 24 °F

    Increasing
    Clouds

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 40. Southwest wind 7 to 9 mph, with gusts as high as 18 mph.

    High: 40 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 30. Southwest wind 6 to 11 mph.

    Low: 30 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of rain after noon. Partly sunny, with a high near 43. Breezy, with a west wind 15 to 18 mph, with gusts as high as 29 mph.

    High: 43 °F

    Breezy.
    Partly Sunny
    then Slight
    Chance Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 23. Blustery, with a northwest wind 17 to 24 mph, with gusts as high as 34 mph.

    Low: 23 °F

    Mostly Cloudy
    and Blustery

  • Wednesday

    Wednesday: Partly sunny, with a high near 26. Blustery, with a north wind 21 to 25 mph, with gusts as high as 36 mph.

    High: 26 °F

    Partly Sunny
    and Blustery

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 11. Blustery, with a north wind 11 to 16 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 24 mph.

    Low: 11 °F

    Mostly Clear
    and Blustery
    then Mostly
    Clear

  • Thursday

    Thursday: A 20 percent chance of snow after noon. Partly sunny, with a high near 26. North wind 5 to 10 mph becoming south in the afternoon.

    High: 26 °F

    Mostly Sunny
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 22. Southwest wind around 10 mph.

    Low: 22 °F

    Chance Snow

Detailed Forecast

Tonight
Increasing clouds, with a low around 24. Southwest wind 8 to 15 mph, with gusts as high as 26 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 40. Southwest wind 7 to 9 mph, with gusts as high as 18 mph.
Monday Night
Mostly cloudy, with a low around 30. Southwest wind 6 to 11 mph.
Tuesday
A 20 percent chance of rain after noon. Partly sunny, with a high near 43. Breezy, with a west wind 15 to 18 mph, with gusts as high as 29 mph.
Tuesday Night
Mostly cloudy, with a low around 23. Blustery, with a northwest wind 17 to 24 mph, with gusts as high as 34 mph.
Wednesday
Partly sunny, with a high near 26. Blustery, with a north wind 21 to 25 mph, with gusts as high as 36 mph.
Wednesday Night
Mostly clear, with a low around 11. Blustery, with a north wind 11 to 16 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 24 mph.
Thursday
A 20 percent chance of snow after noon. Partly sunny, with a high near 26. North wind 5 to 10 mph becoming south in the afternoon.
Thursday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 22. Southwest wind around 10 mph.
Friday
Snow likely, mainly after noon. Mostly cloudy, with a high near 30. West wind 10 to 14 mph. Chance of precipitation is 60%.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 10. Northwest wind around 14 mph.
Saturday
Mostly cloudy, with a high near 16. Northwest wind around 14 mph.
Saturday Night
Mostly cloudy, with a low around 5. West wind 11 to 13 mph.
Sunday
Partly sunny, with a high near 20. West wind 11 to 13 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castalia IA
 43.1°N 91.68°W
Last Update:
5:11 pm CST Jan 11, 2026
Forecast Valid:
7pm CST Jan 11, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation