Castalia Weather Forecast

    • 56
    • 76

    Mostly Cloudy

    • 59
    • 78

    Areas Smoke

    • 61
    • 80

    Partly Sunny

    • 66
    • 82

    Partly Sunny

    • 68
    • 85

    Partly Sunny

    • 70
    • 87

    Partly Sunny

    • 68
    • 86

    Chance Rain Showers

Today 3 Aug Winneshiek

Mostly sunny. Near steady temperature in the mid 70s. South Winds 5 to 10 Mph.

Tonight 3 Aug Winneshiek

Partly cloudy this Evening, then becoming mostly cloudy. Lows in the upper 50s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castalia Temperature Statistics

August Temperature

Decorah (11.8 miles)

  • Lowest 1 August, 2025

    50 °F

  • Average August

    63 °F

  • Highest 1 August, 2025

    73.4 °F

Climate (2020–Present)

Decorah (11.8 miles)

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  • Average Low 2020–2025

    39.2 °F

  • Average 2020–2025

    47.9 °F

  • Average High 2020–2025

    56.4 °F
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