Long Island Weather Forecast

    • 56
    • 64

    Mostly Sunny

    • 62
    • 72

    Mostly Sunny

    • 65
    • 73

    Chance Rain Showers

    • 61
    • 71

    Partly Sunny

    • 61
    • 66

    Chance Rain Showers

    • 60
    • 68

    Chance Rain

Today 15 Sep Eastern Plymouth

Sunny. Highs in the upper 60s. Northeast Winds 5 to 10 Mph.

Tonight 15 Sep Eastern Plymouth

Mostly clear. Lows in the lower 50s. Southeast Winds around 5 Mph, becoming south after midnight.

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Long Island Temperature Statistics

September Temperature

Marshfield Airport (3.7 miles)

  • Lowest 12 September, 2026

    48.2 °F

  • Average September

    67 °F

  • Highest 10 September, 2026

    87.8 °F

Climate (2021–2026)

Marshfield Airport (3.7 miles)

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  • Average Low 2021–2026

    44 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    60.2 °F
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