Mount Sinai Harbor Weather Forecast

    • 71
    • 80

    Chance Thunderstorms

    • 71
    • 81

    Thunderstorms Likely

    • 69
    • 80

    Mostly Cloudy

    • 67
    • 81

    Slight Chance Thunderstorms

    • 66
    • 79

    Mostly Sunny

    • 69
    • 80

    Mostly Cloudy

    • 73
    • 83

    Slight Chance Thunderstorms

Today 30 Jun Northwest Suffolk

Mostly sunny. Highs in the mid 80s. Southeast Winds 5 to 10 Mph.

Tonight 30 Jun Northwest Suffolk

Mostly cloudy. A chance of Showers and Thunderstorms after midnight. Lows in the lower 70s. South Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Real-Time

Mount Sinai Harbor Temperature Statistics

June Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 2 June, 2025

    49.6 °F

  • Average June

    71.7 °F

  • Highest 24 June, 2025

    101.6 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (11.8 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63 °F
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