Long Island Weather Forecast

    • 63
    • 73

    Sunny

    • 55
    • 74

    Mostly Sunny

    • 51
    • 64

    Mostly Sunny

    • 54
    • 67

    Partly Sunny

    • 61
    • 72

    Partly Sunny

    • 64
    • 80

    Slight Chance Rain Showers

Today 18 Sep Suffolk

Mostly sunny. Highs in the upper 70s. South Winds around 5 Mph.

Tonight 18 Sep Suffolk

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

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Long Island Temperature Statistics

September Temperature

Boston, Logan International Airport (3.1 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 (3.1 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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