Roslyn Harbor Weather Forecast

    • 66
    • 80

    Chance Rain Showers

    • 56
    • 75

    Mostly Sunny

    • 58
    • 73

    Mostly Sunny

    • 64
    • 78

    Partly Sunny

    • 65
    • 80

    Partly Sunny

    • 62
    • 80

    Chance Rain Showers

Today 13 Sep Northern Nassau

Showers with a chance of Thunderstorms this Morning, then partly sunny with Showers likely with a slight chance of Thunderstorms this afternoon. Locally heavy rainfall possible. Highs in the upper 70s. East Winds 5 to 10 Mph, becoming northwest this afternoon. Chance of rain near 100 percent.

Tonight 13 Sep Northern Nassau

Partly cloudy. A slight chance of Showers after midnight. Humid with Lows in the mid 60s. Southwest Winds around 5 Mph, becoming west after midnight. Chance of rain 20 percent.

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Roslyn Harbor Temperature Statistics

September Temperature

Farmingdale - Republic Airport (12.4 miles)

  • Lowest 7 September, 2026

    57 °F

  • Average September

    72.7 °F

  • Highest 3 September, 2026

    87.1 °F

Climate (2021–2026)

Farmingdale - Republic Airport (12.4 miles)

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  • Average Low 2021–2026

    48.1 °F

  • Average 2021–2026

    55.7 °F

  • Average High 2021–2026

    63 °F
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