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

64°F

18°C

Humidity 78%
Wind Speed NW 3 mph
Barometer 30.02 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 9 Sep 11:55 pm CDT
Extended Forecast for

Castalia IA

  • Overnight

    Overnight: Areas of fog after 5am. Otherwise, partly cloudy, with a low around 55. Light northwest wind.

    Low: 55 °F

    Areas Fog

  • Thursday

    Thursday: Areas of fog before 8am. Otherwise, sunny, with a high near 77. Calm wind.

    High: 77 °F

    Areas Fog
    then Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 56. Calm wind becoming south around 6 mph after midnight.

    Low: 56 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 77. South wind 6 to 14 mph, with gusts as high as 22 mph.

    High: 77 °F

    Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. South wind 10 to 13 mph, with gusts as high as 21 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Partly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 76. Southwest wind 7 to 10 mph becoming northwest in the afternoon.

    High: 76 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 72. Calm wind becoming east around 5 mph in the morning.

    High: 72 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. East wind 7 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    Low: 59 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Overnight
Areas of fog after 5am. Otherwise, partly cloudy, with a low around 55. Light northwest wind.
Thursday
Areas of fog before 8am. Otherwise, sunny, with a high near 77. Calm wind.
Thursday Night
Clear, with a low around 56. Calm wind becoming south around 6 mph after midnight.
Friday
Sunny, with a high near 77. South wind 6 to 14 mph, with gusts as high as 22 mph.
Friday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. South wind 10 to 13 mph, with gusts as high as 21 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Partly sunny, with a high near 76. Southwest wind 7 to 10 mph becoming northwest in the afternoon.
Saturday Night
Partly cloudy, with a low around 54. Calm wind.
Sunday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 72. Calm wind becoming east around 5 mph in the morning.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. East wind 7 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Monday
Showers and possibly a thunderstorm. High near 80. Breezy, with a south wind 14 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 56. Breezy, with a southwest wind 9 to 16 mph becoming northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 60%.
Tuesday
A 20 percent chance of showers. Partly sunny, with a high near 70. Northwest wind 3 to 7 mph.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 53. Calm wind.
Wednesday
A 40 percent chance of showers. Partly sunny, with a high near 70. Southeast wind 3 to 6 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:
9:16 pm CDT Sep 9, 2026
Forecast Valid:
12am CDT Sep 10, 2026-6pm CDT Sep 16, 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