Mystic River - Island End River Weather Forecast

    • 59
    • 70

    Chance Rain Showers

    • 55
    • 70

    Mostly Sunny

    • 61
    • 77

    Mostly Sunny

    • 62
    • 78

    Partly Sunny

    • 69
    • 78

    Chance Rain Showers

    • 60
    • 81

    Partly Sunny

Today 5 Sep Suffolk

Partly sunny. A chance of Showers. Cooler. Near steady temperature in the upper 60s. Northeast Winds 5 to 10 Mph. Gusts up to 20 Mph. Chance of rain 30 percent.

Tonight 5 Sep Suffolk

Mostly cloudy with a chance of Showers in the Evening, then partly cloudy after midnight. Lows in the upper 50s. North Winds 5 to 10 Mph. Chance of rain 30 percent.

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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 3 September, 2026

    63 °F

  • Average September

    67.5 °F

  • Highest 2 September, 2026

    72.6 °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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