Mystic River - Island End River Weather Forecast

    • 49
    • 69

    Rain Showers Likely

    • 48
    • 61

    Mostly Sunny

    • 53
    • 73

    Partly Sunny

    • 55
    • 72

    Mostly Sunny

    • 60
    • 80

    Mostly Sunny

    • 64
    • 87

    Partly Sunny

Today 31 May Suffolk

Cloudy with a chance of Showers with a slight chance of Thunderstorms. Not as cool. Near steady temperature in the mid 60s. Northwest Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 31 May Suffolk

Mostly cloudy. Showers likely with a slight chance of Thunderstorms in the evening. Lows in the upper 40s. West Winds around 5 Mph. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mystic River - Island End River Temperature Statistics

May Temperature

Boston, Logan International Airport (2.5 miles)

  • Lowest 9 May, 2026

    42.7 °F

  • Average May

    61.8 °F

  • Highest 19 May, 2026

    96.7 °F

Climate (2021–Present)

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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