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.

Overcast

63°F

17°C

Humidity 100%
Wind Speed SW 5 mph
Barometer 30.09 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 25 Aug 2:35 am CDT
Extended Forecast for

Castalia IA

  • Overnight

    Overnight: Mostly cloudy, with a low around 61. Light south wind.

    Low: 61 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79. South wind 5 to 11 mph.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms between 11pm and 1am. Partly cloudy, with a low around 63. South wind 5 to 9 mph becoming west after midnight. Chance of precipitation is 20%.

    Low: 63 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 80. Northwest wind 6 to 13 mph, with gusts as high as 21 mph.

    High: 80 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 61. Northwest wind 3 to 8 mph.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 79. North wind 3 to 6 mph.

    High: 79 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 57. Calm wind.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 80. Calm wind.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. Calm wind becoming south around 6 mph after midnight.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 61. Light south wind.
Tuesday
Mostly sunny, with a high near 79. South wind 5 to 11 mph.
Tuesday Night
A slight chance of showers and thunderstorms between 11pm and 1am. Partly cloudy, with a low around 63. South wind 5 to 9 mph becoming west after midnight. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 80. Northwest wind 6 to 13 mph, with gusts as high as 21 mph.
Wednesday Night
Mostly clear, with a low around 61. Northwest wind 3 to 8 mph.
Thursday
Sunny, with a high near 79. North wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 57. Calm wind.
Friday
Sunny, with a high near 80. Calm wind.
Friday Night
Partly cloudy, with a low around 61. Calm wind becoming south around 6 mph after midnight.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. South wind 7 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South wind 11 to 13 mph, with gusts as high as 22 mph.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84. South wind 10 to 13 mph, with gusts as high as 21 mph.
Sunday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67. South wind 6 to 8 mph.
Monday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. South wind around 7 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:
1:25 am CDT Aug 25, 2026
Forecast Valid:
2am CDT Aug 25, 2026-6pm CDT Aug 31, 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