National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
News Headlines
Current conditions at

Decorah (KDEH)

Lat: 43.28°NLon: 91.73°WElev: 1158ft.

Fair

30°F

-1°C

Humidity 100%
Wind Speed Calm
Barometer 30.02 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 22 Nov 12:55 am CST
Extended Forecast for

Castalia IA

  • Overnight

    Overnight: Partly cloudy, with a low around 26. Calm wind becoming south around 5 mph.

    Low: 26 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 51. South wind 5 to 14 mph becoming west in the afternoon. Winds could gust as high as 23 mph.

    High: 51 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 29. Northwest wind 3 to 7 mph.

    Low: 29 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 52. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 52 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34. South wind 3 to 6 mph.

    Low: 34 °F

    Mostly Clear

  • Monday

    Monday: Rain likely, mainly after noon. Mostly cloudy, with a high near 51. South wind 6 to 9 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 51 °F

    Slight Chance
    Rain then
    Rain Likely

  • Monday Night

    Monday Night: Rain, mainly before midnight. Low around 40. Southeast wind around 7 mph becoming west after midnight. Chance of precipitation is 80%.

    Low: 40 °F

    Rain then
    Chance Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain, mainly before noon. Partly sunny, with a high near 47. West wind 6 to 14 mph.

    High: 47 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A slight chance of rain and snow before midnight. Mostly cloudy, with a low around 25. West wind 11 to 14 mph. Chance of precipitation is 20%.

    Low: 25 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 26. Calm wind becoming south around 5 mph.
Saturday
Mostly sunny, with a high near 51. South wind 5 to 14 mph becoming west in the afternoon. Winds could gust as high as 23 mph.
Saturday Night
Mostly clear, with a low around 29. Northwest wind 3 to 7 mph.
Sunday
Sunny, with a high near 52. Calm wind becoming southwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 34. South wind 3 to 6 mph.
Monday
Rain likely, mainly after noon. Mostly cloudy, with a high near 51. South wind 6 to 9 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Rain, mainly before midnight. Low around 40. Southeast wind around 7 mph becoming west after midnight. Chance of precipitation is 80%.
Tuesday
A 30 percent chance of rain, mainly before noon. Partly sunny, with a high near 47. West wind 6 to 14 mph.
Tuesday Night
A slight chance of rain and snow before midnight. Mostly cloudy, with a low around 25. West wind 11 to 14 mph. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 34. Breezy, with a west wind 13 to 18 mph.
Wednesday Night
Mostly cloudy, with a low around 19. West wind 9 to 11 mph.
Thanksgiving Day
Partly sunny, with a high near 32. West wind 7 to 11 mph.
Thursday Night
Mostly cloudy, with a low around 16. Northwest wind around 7 mph.
Friday
Mostly sunny, with a high near 31. Northwest wind 6 to 8 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castalia IA
 43.13°N 91.68°W
Last Update:
9:31 pm CST Nov 21, 2025
Forecast Valid:
1am CST Nov 22, 2025-6pm CST Nov 28, 2025
 
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