Mount Sinai Harbor Weather Forecast

    • 39
    • 50

    Rain

    • 34
    • 43

    Rain Showers

    • 37
    • 43

    Partly Sunny

    • 40
    • 47

    Chance Rain

    • 43
    • 50

    Rain Likely

    • 29
    • 47

    Partly Sunny

Today 22 Mar Northwest Suffolk

Mostly cloudy. A chance of rain this afternoon. Highs in the mid 50s. South Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 40 percent.

Tonight 22 Mar Northwest Suffolk

Rain. Lows in the upper 30s. South Winds 5 to 10 Mph, becoming north after midnight. Chance of rain 90 percent.

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Mount Sinai Harbor Temperature Statistics

March Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 3 March, 2026

    18.6 °F

  • Average March

    40.4 °F

  • Highest 9 March, 2026

    68.6 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (11.8 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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