Mount Sinai Harbor Weather Forecast

    • 39
    • 50

    Rain

    • 33
    • 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 in the Evening, then Showers after midnight. Lows in the upper 30s. South Winds around 5 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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