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

73°F

23°C

Humidity 61%
Wind Speed Calm
Barometer 30.13 in
Dewpoint 59°F (15°C)
Visibility 9.00 mi
Last update 3 Aug 5:55 pm CDT
Extended Forecast for

Castalia IA

  • Tonight

    Tonight: Partly cloudy, with a low around 56. Southeast wind around 5 mph becoming calm in the evening.

    Low: 56 °F

    Partly Cloudy

  • Monday

    Monday: Areas of smoke after 9am. Mostly sunny, with a high near 78. Calm wind becoming southeast 5 to 7 mph in the morning.

    High: 78 °F

    Areas Smoke

  • Monday Night

    Monday Night: Partly cloudy, with a low around 59. Calm wind.

    Low: 59 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 80. Southeast wind 3 to 6 mph.

    High: 80 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 61. Southeast wind 3 to 5 mph.

    Low: 61 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 82. South wind 5 to 8 mph.

    High: 82 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 66. South wind around 6 mph.

    Low: 66 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 85. South wind 6 to 8 mph.

    High: 85 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 68. South wind around 7 mph.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 56. Southeast wind around 5 mph becoming calm in the evening.
Monday
Areas of smoke after 9am. Mostly sunny, with a high near 78. Calm wind becoming southeast 5 to 7 mph in the morning.
Monday Night
Partly cloudy, with a low around 59. Calm wind.
Tuesday
Mostly sunny, with a high near 80. Southeast wind 3 to 6 mph.
Tuesday Night
Partly cloudy, with a low around 61. Southeast wind 3 to 5 mph.
Wednesday
Mostly sunny, with a high near 82. South wind 5 to 8 mph.
Wednesday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 66. South wind around 6 mph.
Thursday
Mostly sunny, with a high near 85. South wind 6 to 8 mph.
Thursday Night
Partly cloudy, with a low around 68. South wind around 7 mph.
Friday
Mostly sunny, with a high near 87. South wind 8 to 11 mph, with gusts as high as 20 mph.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 70. South wind around 9 mph.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. South wind 9 to 11 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68. South wind around 8 mph.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84. Southwest wind around 8 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:
5:29 pm CDT Aug 3, 2025
Forecast Valid:
6pm CDT Aug 3, 2025-6pm CDT Aug 10, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation