Charlestown Weather Forecast

    • 59
    • 75

    Partly Sunny

    • 58
    • 78

    Chance Thunderstorms

    • 56
    • 73

    Mostly Sunny

    • 56
    • 77

    Mostly Sunny

    • 58
    • 78

    Partly Sunny

    • 59
    • 78

    Partly Sunny

Today 13 Sep Suffolk

Sunny. Highs in the mid 70s. South Winds 5 to 10 Mph.

Tonight 13 Sep Suffolk

Partly cloudy. Lows in the upper 50s. Southwest Winds 5 to 10 Mph.

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Charlestown Temperature Statistics

September Temperature

Boston, Logan International Airport (2.5 miles)

  • Lowest 9 September, 2025

    54 °F

  • Average September

    66.1 °F

  • Highest 6 September, 2025

    86 °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

    53.8 °F

  • Average High 2020–2025

    61.1 °F
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