Mystic River - Island End River Weather Forecast

    • 62
    • 76

    Mostly Sunny

    • 61
    • 80

    Partly Sunny

    • 69
    • 77

    Chance Rain Showers

    • 63
    • 83

    Slight Chance Rain Showers

    • 58
    • 75

    Mostly Sunny

    • 62
    • 75

    Mostly Sunny

Today 7 Sep Suffolk

Sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph.

Tonight 7 Sep Suffolk

Mostly clear. Lows in the lower 60s. West Winds 5 to 10 Mph.

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  • Temperature Real-Time

Mystic River - Island End River Temperature Statistics

September Temperature

Boston, Logan International Airport (2.5 miles)

  • Lowest 1 September, 2026

    63.6 °F

  • Average September

    68.6 °F

  • Highest 4 September, 2026

    79 °F

Climate (2021–2026)

Boston, Logan International Airport (2.5 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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