Castle Island Weather Forecast

    • 73
    • 85

    Slight Chance Thunderstorms

    • 69
    • 80

    Chance Rain Showers

    • 68
    • 90

    Mostly Sunny

    • 69
    • 92

    Chance Rain Showers

    • 64
    • 86

    Slight Chance Rain Showers

    • 63
    • 77

    Chance Rain Showers

Today 11 Jun Suffolk

Mostly sunny. Patchy fog this morning. Highs in the upper 80s. West Winds 5 to 10 Mph.

Tonight 11 Jun Suffolk

Partly cloudy. A slight chance of Showers and Thunderstorms in the evening. Patchy fog after midnight. Humid with Lows in the lower 70s. West Winds around 5 Mph. Chance of rain 20 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

    69 °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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