Castle Island Weather Forecast

    • 68
    • 80

    Rain Showers Likely

    • 65
    • 84

    Partly Sunny

    • 64
    • 82

    Mostly Sunny

    • 61
    • 78

    Chance Rain Showers

    • 62
    • 74

    Rain Showers Likely

    • 65
    • 78

    Slight Chance Rain Showers

Today 18 Jun Suffolk

Mostly cloudy. A chance of Showers this Morning, then Showers likely with a slight chance of Thunderstorms this afternoon. Breezy with Highs around 80. South Winds 10 to 15 Mph with Gusts up to 30 Mph, increasing to 15 to 25 Mph with Gusts up to 40 Mph this afternoon. Chance of rain 60 percent.

Tonight 18 Jun Suffolk

Partly cloudy. A chance of Showers with a slight chance of Thunderstorms in the evening. Lows in the mid 60s. Southwest Winds 15 to 20 Mph. Gusts up to 35 Mph in the evening. Chance of rain 30 percent.

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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

    73.1 °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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