Castalia Weather Forecast

    • 26
    • 39

    Breezy

    • 31
    • 37

    Rain/Snow

    • 9
    • 41

    Snow

    • -3
    • 15

    Blustery

    • 15
    • 21

    Chance Snow

    • 27
    • 39

    Mostly Cloudy

Today 13 Mar Winneshiek

Mostly sunny and windy. Highs in the upper 30s. Northwest Winds 20 to 30 Mph with Gusts up to 50 Mph.

Tonight 13 Mar Winneshiek

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the mid 20s. Northwest Winds 10 to 15 Mph, becoming northeast around 5 Mph after midnight.

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Castalia Temperature Statistics

March Temperature

Decorah (11.8 miles)

  • Lowest 1 March, 2026

    12.2 °F

  • Average March

    39.3 °F

  • Highest 9 March, 2026

    68 °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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