Castle Island Weather Forecast

    • 23
    • 51

    Slight Chance Snow Showers

    • 28
    • 33

    Slight Chance Snow

    • 32
    • 41

    Chance Snow

    • 24
    • 40

    Snow Likely

    • 16
    • 33

    Partly Sunny

    • 11
    • 24

    Partly Sunny

Today 15 Jan Suffolk

Cloudy this Morning, then becoming mostly sunny. A 20 percent chance of Showers. Highs around 50. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 15 Jan Suffolk

Partly cloudy. A slight chance of rain and snow Showers in the Evening, then a slight chance of snow Showers after midnight. Much cooler with Lows in the lower 20s. West Winds 10 to 15 Mph with Gusts up to 35 Mph. Chance of precipitation 20 percent.

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Castle Island Temperature Statistics

January Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 5 January, 2026

    16 °F

  • Average January

    31.7 °F

  • Highest 9 January, 2026

    52 °F

Climate (2021–Present)

Boston, Logan International Airport (1.2 miles)

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  • Average Low 2021–2026

    46.9 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    61 °F
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