Mystic River Weather Forecast

    • 67
    • 84

    Mostly Sunny

    • 73
    • 90

    Mostly Sunny

    • 73
    • 97

    Slight Chance Thunderstorms

    • 66
    • 81

    Slight Chance Rain Showers

    • 66
    • 81

    Chance Rain Showers

    • 67
    • 83

    Slight Chance Rain Showers

Today 23 Jul Southeast Middlesex

Mostly sunny. Highs in the mid 80s. West Winds around 5 Mph, becoming south this afternoon.

Tonight 23 Jul Southeast Middlesex

Mostly clear. Lows in the upper 60s. Southwest Winds 5 to 10 Mph.

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Mystic River Temperature Statistics

July Temperature

Boston, Logan International Airport (3.7 miles)

  • Lowest 10 July, 2025

    63.6 °F

  • Average July

    76.3 °F

  • Highest 16 July, 2025

    95.6 °F

Climate (2020–Present)

Boston, Logan International Airport (3.7 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    53.8 °F

  • Average High 2020–2025

    61.1 °F
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