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

61°F

16°C

Humidity 94%
Wind Speed Calm
Barometer 30.10 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 10 Sep 8:35 am CDT
Extended Forecast for

Castalia IA

  • Today

    Today: A 30 percent chance of showers and thunderstorms before 9am. Mostly sunny, with a high near 74. Light and variable wind.

    High: 74 °F

    Chance
    Showers then
    Mostly Sunny

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 55. Calm wind.

    Low: 55 °F

    Partly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 78. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 78 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 57. Calm wind becoming southeast around 6 mph after midnight.

    Low: 57 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 82. South wind 6 to 10 mph.

    High: 82 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 66. Southeast wind around 7 mph.

    Low: 66 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 86. South wind around 7 mph.

    High: 86 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 64. Southeast wind 3 to 5 mph.

    Low: 64 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 86. Southeast wind around 6 mph.

    High: 86 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms before 9am. Mostly sunny, with a high near 74. Light and variable wind.
Tonight
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 55. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 78. Calm wind becoming southeast around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 57. Calm wind becoming southeast around 6 mph after midnight.
Friday
Partly sunny, with a high near 82. South wind 6 to 10 mph.
Friday Night
Mostly cloudy, with a low around 66. Southeast wind around 7 mph.
Saturday
Partly sunny, with a high near 86. South wind around 7 mph.
Saturday Night
Mostly cloudy, with a low around 64. Southeast wind 3 to 5 mph.
Sunday
Mostly sunny, with a high near 86. Southeast wind around 6 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Southeast wind around 6 mph.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82. South wind around 7 mph.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62. Southeast wind around 5 mph.
Tuesday
Mostly sunny, with a high near 84. South wind around 6 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Castalia IA
 43.13°N 91.68°W
Last Update:
8:28 am CDT Sep 10, 2025
Forecast Valid:
8am CDT Sep 10, 2025-6pm CDT Sep 16, 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