Mount Sinai Harbor Weather Forecast

    • 36
    • 45

    Mostly Cloudy

    • 38
    • 44

    Mostly Cloudy

    • 42
    • 47

    Mostly Cloudy

    • 49
    • 52

    Chance Rain Showers

    • 48
    • 56

    Rain Showers

    • 40
    • 53

    Chance Rain Showers

Today 12 Mar Northwest Suffolk

Mostly sunny. Highs in the upper 40s. North Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming east this afternoon.

Tonight 12 Mar Northwest Suffolk

Mostly cloudy. A slight chance of rain Showers after midnight. Lows in the mid 30s. East Winds 5 to 10 Mph. Gusts up to 20 Mph after midnight. Chance of rain 20 percent.

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Mount Sinai Harbor Temperature Statistics

March Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 3 March, 2025

    17.9 °F

  • Average March

    39.9 °F

  • Highest 6 March, 2025

    60.7 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (11.8 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    55 °F

  • Average High 2020–2025

    62.7 °F
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