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

36°F

2°C

Humidity 87%
Wind Speed Vrbl 6 mph
Barometer 30.08 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill31°F (-1°C)
Last update 12 Jan 10:15 am CST
Extended Forecast for

Castalia IA

  • Today

    Today: Sunny, with a high near 41. Southwest wind around 8 mph.

    High: 41 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a steady temperature around 35. Southwest wind 6 to 13 mph, with gusts as high as 22 mph.

    Low: 35 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 43. West wind 13 to 15 mph, with gusts as high as 24 mph.

    High: 43 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 20. Blustery, with a northwest wind 14 to 20 mph, with gusts as high as 28 mph.

    Low: 20 °F

    Mostly Cloudy
    then Cloudy
    and Blustery

  • Wednesday

    Wednesday: Mostly sunny, with a high near 24. Blustery, with a north wind 17 to 22 mph, with gusts as high as 31 mph.

    High: 24 °F

    Mostly Sunny
    and Blustery

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 9. Blustery, with a north wind 11 to 16 mph decreasing to 5 to 10 mph after midnight.

    Low: 9 °F

    Mostly Clear
    and Blustery
    then Mostly
    Clear

  • Thursday

    Thursday: A 30 percent chance of snow after noon. Mostly sunny, with a high near 26. Northwest wind 5 to 10 mph becoming south in the afternoon.

    High: 26 °F

    Mostly Sunny
    then Chance
    Snow

  • Thursday Night

    Thursday Night: Snow likely. Cloudy, with a low around 21. South wind around 11 mph becoming west after midnight. Chance of precipitation is 60%.

    Low: 21 °F

    Snow Likely

  • Friday

    Friday: Snow likely. Mostly cloudy, with a high near 29. Blustery, with a northwest wind 11 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 70%.

    High: 29 °F

    Snow Likely
    and Blustery

Detailed Forecast

Today
Sunny, with a high near 41. Southwest wind around 8 mph.
Tonight
Mostly cloudy, with a steady temperature around 35. Southwest wind 6 to 13 mph, with gusts as high as 22 mph.
Tuesday
Partly sunny, with a high near 43. West wind 13 to 15 mph, with gusts as high as 24 mph.
Tuesday Night
Mostly cloudy, with a low around 20. Blustery, with a northwest wind 14 to 20 mph, with gusts as high as 28 mph.
Wednesday
Mostly sunny, with a high near 24. Blustery, with a north wind 17 to 22 mph, with gusts as high as 31 mph.
Wednesday Night
Mostly clear, with a low around 9. Blustery, with a north wind 11 to 16 mph decreasing to 5 to 10 mph after midnight.
Thursday
A 30 percent chance of snow after noon. Mostly sunny, with a high near 26. Northwest wind 5 to 10 mph becoming south in the afternoon.
Thursday Night
Snow likely. Cloudy, with a low around 21. South wind around 11 mph becoming west after midnight. Chance of precipitation is 60%.
Friday
Snow likely. Mostly cloudy, with a high near 29. Blustery, with a northwest wind 11 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 70%.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 8. Blustery, with a northwest wind 13 to 16 mph.
Saturday
A 20 percent chance of snow. Partly sunny, with a high near 12. Northwest wind 13 to 15 mph, with gusts as high as 23 mph.
Saturday Night
Mostly cloudy, with a low around 0. Northwest wind 11 to 14 mph.
Sunday
Partly sunny, with a high near 16. West wind 11 to 14 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:
6:51 am CST Jan 12, 2026
Forecast Valid:
10am CST Jan 12, 2026-6pm CST Jan 18, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation