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

70°F

21°C

Humidity 73%
Wind Speed S 5 mph
Barometer 30.06 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 3 Oct 11:35 pm CDT
Extended Forecast for

Castalia IA

  • Tonight

    Tonight: Mostly clear, with a low around 65. South wind around 7 mph.

    Low: 65 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 87. Breezy, with a south wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 87 °F

    Sunny then
    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. South wind 13 to 15 mph, with gusts as high as 28 mph.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 82. Breezy, with a south wind 13 to 21 mph, with gusts as high as 32 mph.

    High: 82 °F

    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 54. South wind 9 to 14 mph becoming west after midnight. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 54 °F

    Showers
    Likely

  • Monday

    Monday: A 30 percent chance of showers. Mostly cloudy, with a high near 65. North wind 6 to 8 mph.

    High: 65 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 47. North wind 3 to 5 mph.

    Low: 47 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Sunny, with a high near 67. Northwest wind 5 to 7 mph.

    High: 67 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 42. North wind 3 to 5 mph.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 65. South wind around 7 mph.
Saturday
Sunny, with a high near 87. Breezy, with a south wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 30 mph.
Saturday Night
Mostly clear, with a low around 63. South wind 13 to 15 mph, with gusts as high as 28 mph.
Sunday
Sunny, with a high near 82. Breezy, with a south wind 13 to 21 mph, with gusts as high as 32 mph.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 54. South wind 9 to 14 mph becoming west after midnight. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Monday
A 30 percent chance of showers. Mostly cloudy, with a high near 65. North wind 6 to 8 mph.
Monday Night
A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 47. North wind 3 to 5 mph.
Tuesday
Sunny, with a high near 67. Northwest wind 5 to 7 mph.
Tuesday Night
Mostly clear, with a low around 42. North wind 3 to 5 mph.
Wednesday
Sunny, with a high near 66. Light and variable wind becoming southeast 5 to 7 mph in the morning.
Wednesday Night
Mostly clear, with a low around 43. Southeast wind around 6 mph.
Thursday
Sunny, with a high near 67. South wind 6 to 9 mph.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 50. South wind around 7 mph.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 69. Southwest wind 7 to 9 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castalia IA
 43.1°N 91.68°W
Last Update:
10:13 pm CDT Oct 3, 2025
Forecast Valid:
11pm CDT Oct 3, 2025-6pm CDT Oct 10, 2025
 
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Additional Resources

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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