Boston Harbor - Chelsea Weather Forecast

    • 66
    • 79

    Areas Fog

    • 64
    • 82

    Becoming Sunny

    • 58
    • 73

    Chance Rain Showers

    • 58
    • 70

    Mostly Sunny

    • 61
    • 74

    Mostly Sunny

    • 61
    • 77

    Mostly Cloudy

    • 66
    • 74

    Chance Rain Showers

Today 3 Sep Suffolk

Partly sunny with a chance of Showers and Thunderstorms. Near steady temperature in the upper 70s. Southwest Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 3 Sep Suffolk

Partly cloudy with a slight chance of Showers this Evening, then mostly cloudy after midnight. Areas of fog. Lows in the mid 60s. East Winds around 5 Mph, becoming north around 5 Mph after midnight. Chance of rain 20 percent.

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Boston Harbor - Chelsea Temperature Statistics

September Temperature

Boston, Logan International Airport (1.9 miles)

  • Lowest 1 September, 2026

    64.9 °F

  • Average September

    66.6 °F

  • Highest 1 September, 2026

    69.1 °F

Climate (2021–2026)

Boston, Logan International Airport (1.9 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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