Mystic River - Island End River Weather Forecast

    • 52
    • 78

    Chance Rain Showers

    • 56
    • 66

    Mostly Sunny

    • 62
    • 78

    Partly Sunny

    • 63
    • 76

    Chance Rain Showers

    • 58
    • 75

    Partly Sunny

    • 58
    • 70

    Partly Sunny

Today 14 Sep Suffolk

Partly sunny with a slight chance of Showers this Morning, then sunny this afternoon. Highs in the mid 70s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 20 percent.

Tonight 14 Sep Suffolk

Clear, cooler with Lows in the lower 50s. North Winds 10 to 15 Mph. Gusts up to 25 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mystic River - Island End River Temperature Statistics

September Temperature

Boston, Logan International Airport (2.5 miles)

  • Lowest 6 September, 2026

    59.6 °F

  • Average September

    70.7 °F

  • Highest 10 September, 2026

    87.7 °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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