Castalia Weather Forecast

    • -20
    • 15

    Chance Flurries

    • -15
    • -8

    Cold

    • -10
    • -2

    Cold

    • -12
    • 5

    Cold

    • 0
    • 10

    Cold

    • 1
    • 16

    Mostly Cloudy

Today 22 Jan Winneshiek

Partly sunny with a chance of Flurries. Colder with Highs around 14. Temperature falling to around 5 above this afternoon. West Winds 10 to 20 Mph with Gusts up to 30 Mph. Wind chill Values as low as 20 below this afternoon.

Tonight 22 Jan Winneshiek

Partly cloudy. Much Colder with Lows around 20 below. Northwest Winds 10 to 20 Mph with Gusts up to 30 Mph. Wind chill Values as low as 45 below after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castalia Temperature Statistics

January Temperature

Decorah (11.8 miles)

  • Lowest 19 January, 2026

    -5.8 °F

  • Average January

    23.5 °F

  • Highest 13 January, 2026

    48.2 °F

Climate (2021–Present)

Decorah (11.8 miles)

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  • Average Low 2021–2026

    39.4 °F

  • Average 2021–2026

    48 °F

  • Average High 2021–2026

    56.6 °F
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