Mystic River - Island End River Weather Forecast

    • 40
    • 49

    Rain

    • 27
    • 59

    Rain

    • 32
    • 40

    Slight Chance Rain

    • 23
    • 46

    Slight Chance Rain

    • 21
    • 31

    Partly Sunny

    • 28
    • 38

    Chance Rain/Snow

Today 18 Dec Suffolk

Sunny. Highs in the upper 40s. South Winds 5 to 10 Mph. Gusts up to 20 Mph in the afternoon.

Tonight 18 Dec Suffolk

Mostly cloudy. Patchy fog. Rain after midnight. Not as cool with Lows around 40. Temperature rising into the lower 50s after midnight. South Winds 10 to 15 Mph. Gusts up to 25 Mph, increasing to 35 Mph after midnight. Chance of rain 80 percent.

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Mystic River - Island End River Temperature Statistics

December Temperature

Boston, Logan International Airport (2.5 miles)

  • Lowest 5 December, 2025

    12 °F

  • Average December

    30.8 °F

  • Highest 10 December, 2025

    48 °F

Climate (2020–Present)

Boston, Logan International Airport (2.5 miles)

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  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    53.7 °F

  • Average High 2020–2025

    61 °F
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