Ronkonkoma Weather Forecast

    • 69
    • 82

    Chance Thunderstorms

    • 64
    • 83

    Slight Chance Rain Showers

    • 60
    • 78

    Mostly Sunny

    • 59
    • 74

    Mostly Sunny

    • 62
    • 76

    Partly Sunny

    • 62
    • 77

    Partly Sunny

Today 3 Sep Southwest Suffolk

Mostly cloudy with a chance of Showers and Thunderstorms in the Morning, then partly sunny with a slight chance of Showers and Thunderstorms in the afternoon. Humid with Highs in the lower 80s. Southwest Winds 10 to 15 Mph. Chance of rain 50 percent.

Tonight 3 Sep Southwest Suffolk

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then partly cloudy with a chance of Showers after midnight. Humid with Lows around 70. West Winds 5 to 10 Mph, becoming northwest after midnight. Chance of rain 40 percent.

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Ronkonkoma Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (1.2 miles)

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Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (1.2 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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