Boston Harbor - Chelsea Weather Forecast

    • 56
    • 71

    Becoming Sunny

    • 59
    • 74

    Slight Chance Rain Showers

    • 60
    • 74

    Chance Rain Showers

    • 58
    • 74

    Slight Chance Rain Showers

    • 62
    • 77

    Mostly Sunny

    • 66
    • 83

    Partly Sunny

Today 18 Aug Suffolk

Mostly sunny. Much cooler with Highs in the lower 70s. Northeast Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 18 Aug Suffolk

Partly cloudy in the Evening, then becoming mostly clear. Lows in the mid 50s. East Winds 5 to 10 Mph, becoming northeast after midnight.

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Boston Harbor - Chelsea Temperature Statistics

August Temperature

Boston, Logan International Airport (1.9 miles)

  • Lowest 1 August, 2025

    60.7 °F

  • Average August

    72.8 °F

  • Highest 12 August, 2025

    91.7 °F

Climate (2020–Present)

Boston, Logan International Airport (1.9 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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