Castle Island Weather Forecast

    • 32
    • 36

    Rain/Snow

    • 25
    • 38

    Mostly Cloudy

    • 16
    • 39

    Mostly Cloudy

    • 21
    • 25

    Snow Likely

    • 27
    • 31

    Chance Snow

    • 26
    • 40

    Rain Likely

Today 23 Dec Suffolk

Cloudy. A chance of snow this Morning, then snow likely this afternoon. Patchy fog this afternoon. Highs in the mid 30s. South Winds 5 to 10 Mph. Chance of snow 70 percent.

Tonight 23 Dec Suffolk

Mostly cloudy. Snow with a chance of rain in the Evening, then a chance of Rain, a slight chance of freezing rain and snow after midnight. Patchy fog. Little or no snow accumulation. Near steady temperature in the lower 30s. South Winds around 5 Mph, becoming west with Gusts up to 30 Mph after midnight. Chance of precipitation 90 percent.

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  • Temperature Real-Time

Castle Island Temperature Statistics

December Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 5 December, 2025

    12 °F

  • Average December

    32.7 °F

  • Highest 19 December, 2025

    59 °F

Climate (2020–Present)

Boston, Logan International Airport (1.2 miles)

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  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    53.8 °F

  • Average High 2020–2025

    61.1 °F
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