Boston Harbor - Chelsea Weather Forecast

    • 52
    • 78

    Increasing Clouds

    • 52
    • 64

    Partly Sunny

    • 56
    • 65

    Rain Showers

    • 54
    • 64

    Slight Chance Rain Showers

    • 53
    • 58

    Partly Sunny

    • 52
    • 60

    Partly Sunny

Today 18 Sep Suffolk

Sunny. Patchy fog this morning. Highs in the upper 70s. Northwest Winds 5 to 10 Mph.

Tonight 18 Sep Suffolk

Mostly clear in the Evening, then becoming partly cloudy. Much cooler. Less humid with Lows in the lower 50s. North Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening.

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Boston Harbor - Chelsea Temperature Statistics

September Temperature

Boston, Logan International Airport (1.9 miles)

  • Lowest 15 September, 2026

    54 °F

  • Average September

    69.2 °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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