Castle Island Weather Forecast

    • 64
    • 84

    Mostly Sunny

    • 66
    • 84

    Rain Showers Likely

    • 66
    • 91

    Chance Rain Showers

    • 62
    • 83

    Chance Rain Showers

    • 64
    • 85

    Slight Chance Rain Showers

    • 63
    • 89

    Partly Sunny

Today 9 Jun Suffolk

Sunny, warmer with Highs in the upper 80s. West Winds around 15 Mph with Gusts up to 25 Mph.

Tonight 9 Jun Suffolk

Mostly clear. Lows in the lower 60s. Southwest Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

June Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 1 June, 2026

    49.6 °F

  • Average June

    68.9 °F

  • Highest 4 June, 2026

    89.7 °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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