Mystic River - Island End River Weather Forecast

    • 62
    • 73

    Slight Chance Rain Showers

    • 63
    • 74

    Rain Showers

    • 54
    • 74

    Slight Chance Rain Showers

    • 56
    • 65

    Mostly Sunny

    • 62
    • 78

    Partly Sunny

    • 63
    • 79

    Slight Chance Rain Showers

Today 12 Sep Suffolk

Sunny. Highs in the mid 70s. East Winds around 5 Mph, becoming southeast 10 to 15 Mph.

Tonight 12 Sep Suffolk

Partly cloudy in the Evening, then mostly cloudy with a slight chance of Showers after midnight. Lows in the lower 60s. South Winds 10 to 15 Mph. Chance of rain 20 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 6 September, 2026

    59.6 °F

  • Average September

    70.4 °F

  • Highest 10 September, 2026

    86 °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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