Castle Island Weather Forecast

    • 45
    • 55

    Breezy

    • 45
    • 61

    Mostly Sunny

    • 49
    • 61

    Mostly Sunny

    • 56
    • 66

    Rain Showers Likely

    • 51
    • 64

    Chance Rain Showers

    • 51
    • 63

    Chance Rain Showers

Today 16 Oct Suffolk

Sunny. Highs in the mid 50s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 16 Oct Suffolk

Mostly cloudy in the Evening, then clearing. Lows in the lower 40s. North Winds 15 to 20 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

October Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 10 October, 2025

    41 °F

  • Average October

    59.7 °F

  • Highest 6 October, 2025

    82.9 °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

    61.1 °F
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