Boston Harbor Islands State Park Weather Forecast

    • 67
    • 74

    Rain Showers Likely

    • 65
    • 77

    Partly Sunny

    • 65
    • 76

    Mostly Sunny

    • 67
    • 77

    Mostly Sunny

    • 70
    • 78

    Chance Rain Showers

    • 69
    • 77

    Chance Rain Showers

    • 65
    • 75

    Mostly Sunny

Today 23 Aug Eastern Plymouth

Showers with isolated Thunderstorms. Some Thunderstorms may produce heavy rainfall. Near steady temperature in the mid 70s. Southeast Winds 5 to 10 Mph. Chance of rain near 100 percent.

Tonight 23 Aug Eastern Plymouth

Mostly cloudy. Areas of dense fog after midnight with visibility one quarter mile or less at Times. Lows in the mid 60s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Boston Harbor Islands State Park Temperature Statistics

August Temperature

Boston, Logan International Airport (5.6 miles)

  • Lowest 16 August, 2026

    62.7 °F

  • Average August

    77.3 °F

  • Highest 7 August, 2026

    94.6 °F

Climate (2021–2026)

Boston, Logan International Airport (5.6 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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