Mystic River - Island End River Weather Forecast

    • 62
    • 76

    Mostly Cloudy

    • 63
    • 82

    Partly Sunny

    • 66
    • 86

    Partly Sunny

    • 69
    • 88

    Chance Rain Showers

    • 72
    • 86

    Slight Chance Thunderstorms

    • 74
    • 91

    Mostly Sunny

Today 27 Jun Suffolk

Partly sunny. A slight chance of Showers in the afternoon. Highs in the mid 70s. Northwest Winds around 5 Mph, becoming east in the afternoon. Chance of rain 20 percent.

Tonight 27 Jun Suffolk

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the lower 60s. Southeast Winds 5 to 10 Mph, becoming northwest after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mystic River - Island End River Temperature Statistics

June Temperature

Boston, Logan International Airport (2.5 miles)

  • Lowest 1 June, 2026

    49.6 °F

  • Average June

    72.5 °F

  • Highest 14 June, 2026

    91.7 °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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