Mount Sinai Harbor Weather Forecast

    • 40
    • 50

    Increasing Clouds

    • 33
    • 47

    Slight Chance Rain Showers

    • 37
    • 45

    Mostly Sunny

    • 43
    • 49

    Partly Sunny

    • 49
    • 59

    Partly Sunny

    • 47
    • 62

    Partly Sunny

Today 6 Apr Northwest Suffolk

Sunny. Highs in the lower 50s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 6 Apr Northwest Suffolk

Partly cloudy with a 20 percent chance of Showers. Lows in the upper 30s. West Winds 10 to 15 Mph, becoming northwest around 5 Mph after midnight.

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Mount Sinai Harbor Temperature Statistics

April Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 2 April, 2026

    39.7 °F

  • Average April

    52 °F

  • Highest 1 April, 2026

    72.6 °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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