Long Island Mac Arthur Airport Weather Forecast

    • 55
    • 70

    Rain

    • 55
    • 73

    Partly Sunny

    • 58
    • 74

    Chance Rain Showers

    • 58
    • 71

    Slight Chance Rain Showers

    • 56
    • 79

    Partly Sunny

    • 54
    • 71

    Mostly Sunny

Today 7 Sep Southwest Suffolk

Rain. Highs around 70. North Winds 5 to 10 Mph. Chance of rain 90 percent.

Tonight 7 Sep Southwest Suffolk

Mostly cloudy with a slight chance of rain in the Evening, then partly cloudy after midnight. Lows in the mid 50s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

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Long Island Mac Arthur Airport Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (0 miles)

  • Lowest 2 September, 2025

    57.9 °F

  • Average September

    67.8 °F

  • Highest 1 September, 2025

    77 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (0 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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