Castle Island Weather Forecast

    • 79
    • 99

    Isolated Thunderstorms

    • 80
    • 99

    Thunderstorms

    • 74
    • 95

    Thunderstorms

    • 67
    • 78

    Chance Rain Showers

    • 63
    • 72

    Chance Rain Showers

    • 65
    • 73

    Partly Sunny

Today 2 Jul Suffolk

Partly sunny. Isolated Showers and Thunderstorms this afternoon. Hot with Highs in the upper 90s. West Winds 10 to 15 Mph. Chance of rain 20 percent. Heat index Values up to 108.

Tonight 2 Jul Suffolk

Partly cloudy with isolated Showers and Thunderstorms. Humid with Lows in the upper 70s. West Winds 10 to 15 Mph. Chance of rain 20 percent. Heat index Values up to 106 early in the evening.

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Castle Island Temperature Statistics

July Temperature

Boston, Logan International Airport (1.2 miles)

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  • Average July

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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

    60.9 °F
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