Castle Island Weather Forecast

    • 22
    • 38

    Decreasing Clouds

    • 14
    • 26

    Mostly Sunny

    • 30
    • 36

    Slight Chance Snow

    • 35
    • 44

    Chance Rain

    • 29
    • 41

    Slight Chance Snow

    • 24
    • 37

    Chance Snow

Today 7 Dec Suffolk

Mostly sunny. Near steady temperature in the mid 30s. Northwest Winds around 5 Mph, becoming west around 5 Mph.

Tonight 7 Dec Suffolk

Mostly cloudy in the Evening, then clearing. Lows in the lower 20s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming west 10 to 15 Mph with Gusts up to 30 Mph after midnight.

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Castle Island Temperature Statistics

December Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 5 December, 2025

    12 °F

  • Average December

    31.8 °F

  • Highest 1 December, 2025

    43 °F

Climate (2020–Present)

Boston, Logan International Airport (1.2 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    53.8 °F

  • Average High 2020–2025

    61 °F
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