Long Beach (Stony Brook) Weather Forecast

    • 62
    • 77

    Partly Sunny

    • 62
    • 73

    Chance Rain Showers

    • 64
    • 71

    Chance Rain Showers

    • 65
    • 77

    Mostly Sunny

    • 57
    • 80

    Mostly Sunny

    • 56
    • 68

    Mostly Sunny

Today 15 Sep Northwest Suffolk

Mostly sunny. Highs in the upper 70s. Northeast Winds 5 to 10 Mph.

Tonight 15 Sep Northwest Suffolk

Partly cloudy. Lows in the upper 50s. East Winds 5 to 10 Mph.

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Long Beach (Stony Brook) Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (9.3 miles)

  • Lowest 9 September, 2025

    54 °F

  • Average September

    68.9 °F

  • Highest 6 September, 2025

    81 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (9.3 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63.1 °F
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