Castle Island Weather Forecast

    • 67
    • 82

    Rain Showers Likely

    • 65
    • 69

    Chance Rain Showers

    • 67
    • 71

    Rain Showers

    • 68
    • 78

    Chance Rain Showers

    • 63
    • 78

    Mostly Sunny

    • 64
    • 76

    Mostly Sunny

    • 67
    • 78

    Partly Sunny

Today 20 Aug Suffolk

Partly sunny. Near steady temperature in the lower 80s. East Winds around 5 Mph.

Tonight 20 Aug Suffolk

Rain this Evening, then rain likely or patchy drizzle after midnight. Lows in the mid 60s. Northeast Winds 5 to 10 Mph. Chance of rain 80 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

August Temperature

Boston, Logan International Airport (1.2 miles)

  • Lowest 16 August, 2026

    62.7 °F

  • Average August

    77.7 °F

  • Highest 7 August, 2026

    94.6 °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

    53.7 °F

  • Average High 2021–2026

    61 °F
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