National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decorah (KDEH)

Lat: 43.28°NLon: 91.73°WElev: 1158ft.

Overcast

70°F

21°C

Humidity 88%
Wind Speed W 8 G 15 mph
Barometer 29.91 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 20 Jun 4:15 am CDT
Extended Forecast for

Castalia IA

Heat Advisory June 21, 12:00pm until June 22, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a steady temperature around 69. South wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm before 10am, then scattered showers and thunderstorms between 10am and noon. Some of the storms could produce heavy rainfall. High near 86. South wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 86 °F

    Heavy Rain
    then Partly
    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 75. Breezy, with a south wind 13 to 17 mph, with gusts as high as 30 mph.

    Low: 75 °F

    Partly Cloudy
    then Mostly
    Clear and
    Breezy

  • Saturday

    Saturday: Sunny, with a high near 93. Heat index values as high as 102. Breezy, with a south wind 18 to 23 mph, with gusts as high as 37 mph.

    High: 93 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 76. Breezy, with a south wind 16 to 18 mph, with gusts as high as 29 mph.

    Low: 76 °F

    Mostly Clear
    and Breezy

  • Sunday

    Sunday: Sunny, with a high near 93. Breezy, with a south wind 16 to 21 mph, with gusts as high as 30 mph.

    High: 93 °F

    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 74. Breezy, with a south wind 14 to 17 mph, with gusts as high as 26 mph.

    Low: 74 °F

    Breezy.
    Mostly Clear
    then Chance
    T-storms

  • Monday

    Monday: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 88. Southwest wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    High: 88 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 65. Northwest wind 6 to 9 mph becoming north after midnight. Chance of precipitation is 80%.

    Low: 65 °F

    Showers

Detailed Forecast

Overnight
Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a steady temperature around 69. South wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Showers and possibly a thunderstorm before 10am, then scattered showers and thunderstorms between 10am and noon. Some of the storms could produce heavy rainfall. High near 86. South wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Friday Night
Partly cloudy, with a low around 75. Breezy, with a south wind 13 to 17 mph, with gusts as high as 30 mph.
Saturday
Sunny, with a high near 93. Heat index values as high as 102. Breezy, with a south wind 18 to 23 mph, with gusts as high as 37 mph.
Saturday Night
Mostly clear, with a low around 76. Breezy, with a south wind 16 to 18 mph, with gusts as high as 29 mph.
Sunday
Sunny, with a high near 93. Breezy, with a south wind 16 to 21 mph, with gusts as high as 30 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 74. Breezy, with a south wind 14 to 17 mph, with gusts as high as 26 mph.
Monday
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 88. Southwest wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Monday Night
Showers and possibly a thunderstorm. Low around 65. Northwest wind 6 to 9 mph becoming north after midnight. Chance of precipitation is 80%.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Northeast wind around 7 mph. Chance of precipitation is 70%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 66. Northeast wind around 6 mph. Chance of precipitation is 80%.
Wednesday
Showers and possibly a thunderstorm. High near 81. South wind around 8 mph. Chance of precipitation is 80%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. South wind around 7 mph. Chance of precipitation is 70%.
Thursday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 80. South wind 8 to 10 mph. Chance of precipitation is 70%.
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ABOUT THIS FORECAST

 
Point Forecast:
Castalia IA
 43.1°N 91.68°W
Last Update:
4:28 am CDT Jun 20, 2025
Forecast Valid:
4am CDT Jun 20, 2025-6pm CDT Jun 26, 2025
 
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Additional Resources

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High Temperature

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Chance of Precipitation