Castle Island Weather Forecast

    • 66
    • 79

    Chance Rain Showers

    • 65
    • 76

    Chance Rain Showers

    • 62
    • 77

    Chance Rain Showers

    • 66
    • 81

    Mostly Sunny

    • 70
    • 88

    Partly Sunny

    • 71
    • 93

    Slight Chance Thunderstorms

Today 25 Jun Suffolk

Mostly cloudy. A chance of Showers in the Morning, then Showers likely with a slight chance of Thunderstorms in the afternoon. Breezy with Highs in the upper 70s. South Winds 10 to 15 Mph with Gusts up to 30 Mph, increasing to 15 to 25 Mph with Gusts up to 40 Mph in the afternoon. Chance of rain 70 percent.

Tonight 25 Jun Suffolk

Mostly cloudy with a chance of Showers in the Evening, then partly cloudy after midnight. Lows in the mid 60s. Southwest Winds 15 to 20 Mph with Gusts up to 35 Mph, becoming west around 10 Mph with Gusts up to 20 Mph after midnight. Chance of rain 40 percent.

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Castle Island Temperature Statistics

June Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 1 June, 2026

    49.6 °F

  • Average June

    72.4 °F

  • Highest 14 June, 2026

    91.7 °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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