Castle Island Weather Forecast

    • 48
    • 66

    Sunny

    • 51
    • 63

    Mostly Sunny

    • 57
    • 64

    Rain Showers Likely

    • 56
    • 64

    Slight Chance Rain Showers

    • 54
    • 64

    Chance Rain Showers

    • 50
    • 61

    Mostly Sunny

Today 9 Oct Suffolk

Sunny. Highs in the mid 60s. West Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 9 Oct Suffolk

Clear. Lows in the mid 40s. West Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

October Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 6 October, 2026

    46.9 °F

  • Average October

    63.4 °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

    61 °F
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