Mystic River - Island End River Weather Forecast

    • 51
    • 63

    Increasing Clouds

    • 53
    • 64

    Rain Showers

    • 51
    • 64

    Mostly Cloudy

    • 51
    • 61

    Mostly Cloudy

    • 51
    • 62

    Slight Chance Rain Showers

    • 51
    • 61

    Chance Rain Showers

Today 19 Sep Suffolk

Mostly sunny. Much cooler with Highs in the lower 60s. Northeast Winds 5 to 10 Mph.

Tonight 19 Sep Suffolk

Partly cloudy. Lows around 50. South Winds around 5 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 15 September, 2026

    53.7 °F

  • Average September

    69.1 °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

    46.6 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    61 °F
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