Mount Sinai Harbor Weather Forecast

    • 61
    • 78

    Increasing Clouds

    • 58
    • 69

    Mostly Sunny

    • 58
    • 69

    Partly Sunny

    • 64
    • 72

    Partly Sunny

    • 66
    • 78

    Slight Chance Rain Showers

    • 64
    • 77

    Chance Rain Showers

Today 19 Sep Northwest Suffolk

Sunny. Highs in the lower 80s. Northwest Winds around 5 Mph.

Tonight 19 Sep Northwest Suffolk

Partly cloudy in the Evening, then clearing. Lows in the upper 50s. North Winds 10 to 15 Mph.

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Mount Sinai Harbor Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 9 September, 2025

    54 °F

  • Average September

    69.3 °F

  • Highest 6 September, 2025

    81 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (11.8 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63.1 °F
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