Castle Island Weather Forecast

    • 46
    • 69

    Rain Showers

    • 37
    • 50

    Chance Rain Showers

    • 43
    • 53

    Sunny

    • 48
    • 59

    Partly Sunny

    • 50
    • 61

    Partly Sunny

    • 48
    • 59

    Mostly Sunny

Today 16 Oct Suffolk

Showers likely in the Morning, then Showers likely with a slight chance of Thunderstorms in the afternoon. Patchy fog. Highs in the upper 60s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

Tonight 16 Oct Suffolk

Showers. Lows in the upper 40s. Southwest Winds 10 to 15 Mph, becoming west after midnight. Gusts up to 30 Mph. Chance of rain 90 percent.

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  • Temperature Real-Time

Castle Island Temperature Statistics

October Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 7 October, 2026

    43.6 °F

  • Average October

    61.1 °F

  • Highest 2 October, 2026

    87.7 °F

Climate (2021–2026)

Boston, Logan International Airport (1.2 miles)

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  • Average Low 2021–2026

    46.6 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    60.9 °F
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