Castle Island Weather Forecast

    • 65
    • 89

    Mostly Sunny

    • 68
    • 89

    Partly Sunny

    • 68
    • 89

    Mostly Cloudy

    • 57
    • 77

    Rain Showers

    • 57
    • 64

    Partly Sunny

    • 60
    • 74

    Partly Sunny

Today 4 Jun Suffolk

Sunny. Highs in the upper 80s. Southwest Winds 5 to 10 Mph.

Tonight 4 Jun Suffolk

Clear. Lows in the upper 50s. Southwest Winds 5 to 10 Mph.

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  • Temperature Real-Time

Castle Island Temperature Statistics

June Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 1 June, 2026

    48.9 °F

  • Average June

    53.6 °F

  • Highest 1 June, 2026

    55.9 °F

Climate (2021–Present)

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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