Boston Harbor - Charlestown Weather Forecast

    • 54
    • 66

    Increasing Clouds

    • 53
    • 63

    Mostly Cloudy

    • 53
    • 64

    Partly Sunny

    • 52
    • 63

    Chance Rain Showers

    • 54
    • 62

    Rain Showers Likely

    • 55
    • 63

    Rain Showers Likely

    • 54
    • 64

    Chance Rain Showers

Today 21 Sep Suffolk

Partly sunny with a 30 percent chance of Showers. Highs in the mid 60s.

Tonight 21 Sep Suffolk

Mostly cloudy. Near steady temperature in the upper 50s. Northeast Winds 5 to 10 Mph. Gusts up to 20 Mph.

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Boston Harbor - Charlestown Temperature Statistics

September Temperature

Boston, Logan International Airport (1.9 miles)

  • Lowest 15 September, 2026

    53.7 °F

  • Average September

    68.7 °F

  • Highest 10 September, 2026

    87.7 °F

Climate (2021–2026)

Boston, Logan International Airport (1.9 miles)

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  • Average Low 2021–2026

    46.6 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    61 °F
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