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.

A Few Clouds

64°F

18°C

Humidity 88%
Wind Speed Calm
Barometer 30.00 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 22 Aug 1:55 am CDT
Extended Forecast for

Castalia IA

  • Overnight

    Overnight: Mostly clear, with a low around 60. Northwest wind around 6 mph.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 79. Northwest wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 54. North wind 5 to 9 mph.

    Low: 54 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 76. Northwest wind 3 to 8 mph.

    High: 76 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 54. Northwest wind around 5 mph becoming calm in the evening.

    Low: 54 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 74. Calm wind.

    High: 74 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58. Calm wind.

    Low: 58 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 78. Calm wind becoming south 5 to 8 mph in the morning.

    High: 78 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62. South wind around 6 mph.

    Low: 62 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 60. Northwest wind around 6 mph.
Saturday
Sunny, with a high near 79. Northwest wind 7 to 15 mph, with gusts as high as 23 mph.
Saturday Night
Clear, with a low around 54. North wind 5 to 9 mph.
Sunday
Sunny, with a high near 76. Northwest wind 3 to 8 mph.
Sunday Night
Partly cloudy, with a low around 54. Northwest wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 74. Calm wind.
Monday Night
Partly cloudy, with a low around 58. Calm wind.
Tuesday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 78. Calm wind becoming south 5 to 8 mph in the morning.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62. South wind around 6 mph.
Wednesday
Sunny, with a high near 81. West wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday Night
Mostly clear, with a low around 60. West wind 3 to 7 mph.
Thursday
Sunny, with a high near 79. Calm wind becoming north around 5 mph.
Thursday Night
Mostly clear, with a low around 60. Calm wind.
Friday
Mostly sunny, with a high near 80. Light southeast wind.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castalia IA
 43.1°N 91.68°W
Last Update:
1:26 am CDT Aug 22, 2026
Forecast Valid:
2am CDT Aug 22, 2026-6pm CDT Aug 28, 2026
 
Forecast Discussion
 
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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