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

61°F

16°C

Humidity 94%
Wind Speed Calm
Barometer 30.02 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 27 Aug 1:15 am CDT
Extended Forecast for

Castalia IA

  • Overnight

    Overnight: Clear, with a low around 59. Light northwest wind.

    Low: 59 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 80. Northwest wind 3 to 5 mph.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55. Calm wind.

    Low: 55 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 80. Light and variable wind.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 62. Calm wind becoming south 5 to 7 mph after midnight.

    Low: 62 °F

    Mostly Cloudy

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. South wind 9 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 78 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 67. South wind 13 to 15 mph, with gusts as high as 25 mph.

    Low: 67 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. South wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 86 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 70. South wind around 9 mph, with gusts as high as 18 mph.

    Low: 70 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Clear, with a low around 59. Light northwest wind.
Thursday
Sunny, with a high near 80. Northwest wind 3 to 5 mph.
Thursday Night
Mostly clear, with a low around 55. Calm wind.
Friday
Sunny, with a high near 80. Light and variable wind.
Friday Night
Mostly cloudy, with a low around 62. Calm wind becoming south 5 to 7 mph after midnight.
Saturday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. South wind 9 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 67. South wind 13 to 15 mph, with gusts as high as 25 mph.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. South wind 10 to 14 mph, with gusts as high as 22 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 70. South wind around 9 mph, with gusts as high as 18 mph.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 85. Southwest wind 7 to 9 mph.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southwest wind 3 to 5 mph.
Tuesday
A 40 percent chance of showers. Partly sunny, with a high near 83. Light and variable wind.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Light east wind.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83. Southeast wind 3 to 6 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:
12:36 am CDT Aug 27, 2026
Forecast Valid:
1am CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
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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