Mount Sinai Harbor Weather Forecast

    • 38
    • 40

    Chance Rain

    • 36
    • 44

    Gradual Clearing

    • 36
    • 42

    Partly Sunny

    • 44
    • 48

    Rain Likely

    • 40
    • 47

    Rain

    • 34
    • 45

    Chance Rain

    • 34
    • 39

    Partly Sunny

Today 6 Jan Northwest Suffolk

Cloudy. Highs in the lower 40s. East Winds around 5 Mph.

Tonight 6 Jan Northwest Suffolk

Cloudy with a 50 percent chance of rain. Patchy fog. Lows in the mid 30s. East Winds around 5 Mph, becoming south after midnight.

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  • Temperature Real-Time

Mount Sinai Harbor Temperature Statistics

January Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 1 January, 2026

    21 °F

  • Average January

    27.6 °F

  • Highest 1 January, 2026

    36 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (11.8 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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