Castle Island Weather Forecast

    • 71
    • 87

    Increasing Clouds

    • 69
    • 85

    Chance Thunderstorms

    • 66
    • 78

    Partly Sunny

    • 65
    • 78

    Mostly Sunny

    • 68
    • 81

    Mostly Sunny

    • 72
    • 86

    Mostly Sunny

Today 9 Jul Suffolk

Mostly sunny and warmer. Near steady temperature in the upper 80s. Southwest Winds around 10 Mph.

Tonight 9 Jul Suffolk

Mostly cloudy. Patchy fog after midnight. Humid with Lows in the lower 70s. Southwest Winds 5 to 10 Mph.

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Castle Island Temperature Statistics

July Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 7 July, 2026

    63 °F

  • Average July

    80 °F

  • Highest 2 July, 2026

    101.6 °F

Climate (2021–2026)

Boston, Logan International Airport (1.2 miles)

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  • Average Low 2021–2026

    46.7 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    61 °F
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