South Boston Weather Forecast

    • 62
    • 74

    Becoming Sunny

    • 53
    • 75

    Mostly Sunny

    • 50
    • 65

    Mostly Sunny

    • 52
    • 67

    Partly Sunny

    • 60
    • 73

    Partly Sunny

    • 64
    • 80

    Slight Chance Rain Showers

Today 18 Sep Suffolk

Mostly cloudy with isolated Showers with patchy drizzle this Morning, then mostly sunny this afternoon. Patchy fog this morning. Highs in the upper 70s. North Winds around 5 Mph, becoming east around 5 Mph this afternoon. Chance of rain 20 percent.

Tonight 18 Sep Suffolk

Clear. Lows in the lower 60s. Southwest Winds around 5 Mph, becoming west after midnight.

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South Boston Temperature Statistics

September Temperature

Boston, Logan International Airport (1.9 miles)

  • Lowest 9 September, 2025

    54 °F

  • Average September

    65.4 °F

  • Highest 6 September, 2025

    86 °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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