Castalia Weather Forecast

    • 35
    • 54

    Chance Rain Showers

    • 31
    • 51

    Mostly Cloudy

    • 42
    • 58

    Partly Sunny

    • 42
    • 67

    Slight Chance Thunderstorms

    • 41
    • 68

    Chance Rain Showers

    • 40
    • 62

    Chance Rain Showers

Today 30 Apr Winneshiek

Partly sunny. Highs in the lower 50s. Northwest Winds 10 to 15 Mph.

Tonight 30 Apr Winneshiek

Partly cloudy. A chance of Sprinkles after midnight. Areas of frost after midnight. Lows in the mid 30s. Northwest Winds 10 to 15 Mph.

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Castalia Temperature Statistics

April Temperature

Decorah (11.8 miles)

  • Lowest 7 April, 2026

    23 °F

  • Average April

    46.3 °F

  • Highest 17 April, 2026

    77 °F

Climate (2021–Present)

Decorah (11.8 miles)

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  • Average Low 2021–2026

    39.5 °F

  • Average 2021–2026

    48.2 °F

  • Average High 2021–2026

    56.8 °F
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