Castle Island Weather Forecast

    • 62
    • 77

    Sunny

    • 63
    • 78

    Mostly Sunny

    • 63
    • 78

    Mostly Sunny

    • 64
    • 76

    Mostly Sunny

    • 67
    • 77

    Chance Rain Showers

    • 68
    • 79

    Chance Thunderstorms

Today 23 Jul Suffolk

Sunny. Near steady temperature in the upper 70s. Northwest Winds around 5 Mph.

Tonight 23 Jul Suffolk

Clear. Lows in the lower 60s. Southwest Winds around 5 Mph.

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  • Temperature Real-Time

Castle Island Temperature Statistics

July Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 8 July, 2026

    61.6 °F

  • Average July

    77.4 °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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