Mystic River - Island End River Weather Forecast

    • 54
    • 60

    Rain Showers

    • 54
    • 65

    Mostly Cloudy

    • 56
    • 70

    Partly Sunny

    • 64
    • 77

    Partly Sunny

    • 55
    • 77

    Slight Chance Rain Showers

    • 51
    • 66

    Partly Sunny

Today 28 Sep Suffolk

Showers. Patchy fog. Near steady temperature in the upper 50s. Northeast Winds 15 to 20 Mph. Gusts up to 30 Mph this morning. Chance of rain near 100 percent.

Tonight 28 Sep Suffolk

Cloudy. Showers, mainly in the evening. Patchy fog. Near steady temperature in the upper 50s. North Winds 10 to 15 Mph. Chance of rain 90 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 24 September, 2026

    49.6 °F

  • Average September

    66 °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

    60.9 °F
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