Mount Sinai Weather Forecast

    • 72
    • 91

    Mostly Sunny

    • 74
    • 95

    Mostly Sunny

    • 68
    • 90

    Chance Rain Showers

    • 64
    • 80

    Chance Rain Showers

    • 65
    • 75

    Rain Showers

    • 67
    • 79

    Chance Rain Showers

Today 23 Jun Northwest Suffolk

Sunny with Highs in the lower 90s. North Winds around 5 Mph, becoming south in the afternoon. Heat index Values up to 101.

Tonight 23 Jun Northwest Suffolk

Partly cloudy. Lows in the lower 70s. Northwest Winds around 5 Mph.

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Mount Sinai Temperature Statistics

June Temperature

Islip, Long Island Mac Arthur Airport (11.2 miles)

  • Lowest 2 June, 2025

    49.6 °F

  • Average June

    68.9 °F

  • Highest 12 June, 2025

    87.1 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (11.2 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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