Mount Sinai Harbor Weather Forecast

    • 47
    • 62

    Mostly Cloudy

    • 51
    • 64

    Mostly Sunny

    • 53
    • 63

    Rain Showers

    • 51
    • 64

    Rain Showers Likely

    • 54
    • 67

    Slight Chance Rain Showers

    • 55
    • 71

    Partly Sunny

Today 11 May Northwest Suffolk

Mostly cloudy. Highs in the mid 60s. North Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming northwest this afternoon.

Tonight 11 May Northwest Suffolk

Partly cloudy. Lows in the upper 40s. West Winds around 5 Mph, becoming north after midnight.

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  • Temperature Real-Time

Mount Sinai Harbor Temperature Statistics

May Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 1 May, 2026

    40.6 °F

  • Average May

    55.4 °F

  • Highest 5 May, 2026

    67.6 °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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