Mount Sinai Harbor Weather Forecast

    • 69
    • 77

    Rain Showers Likely

    • 67
    • 76

    Mostly Sunny

    • 68
    • 76

    Mostly Sunny

    • 70
    • 78

    Partly Sunny

    • 71
    • 78

    Chance Rain Showers

    • 71
    • 79

    Slight Chance Thunderstorms

Today 23 Aug Northwest Suffolk

Patchy fog this morning. Mostly cloudy with Showers likely with a chance of Thunderstorms this Morning, then mostly sunny with a chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may produce gusty Winds, small Hail, and heavy rainfall. Highs in the upper 70s. East Winds 5 to 10 Mph, becoming south this afternoon. Chance of rain 70 percent.

Tonight 23 Aug Northwest Suffolk

Mostly clear. Lows in the mid 60s. Southwest Winds 5 to 10 Mph.

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Mount Sinai Harbor Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 4 August, 2026

    63.6 °F

  • Average August

    77.4 °F

  • Highest 7 August, 2026

    91.7 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (11.8 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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