Ronkonkoma Weather Forecast

    • 72
    • 88

    Chance Thunderstorms

    • 66
    • 85

    Mostly Sunny

    • 67
    • 81

    Mostly Sunny

    • 71
    • 86

    Partly Sunny

    • 75
    • 88

    Partly Sunny

    • 76
    • 90

    Slight Chance Thunderstorms

Today 20 Jul Southwest Suffolk

Mostly cloudy in the Morning, then becoming partly sunny. Patchy fog in the morning. A chance of Showers with a slight chance of Thunderstorms. Humid with Highs in the mid 80s. Southwest Winds 5 to 10 Mph. Gusts up to 20 Mph in the afternoon. Chance of rain 40 percent. Heat index Values in the upper 90s.

Tonight 20 Jul Southwest Suffolk

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Some Thunderstorms may produce gusty Winds in the evening. Humid with Lows in the lower 70s. West Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming northwest after midnight. Chance of rain 40 percent.

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Ronkonkoma Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (1.2 miles)

  • Lowest 5 July, 2025

    64.7 °F

  • Average July

    78.2 °F

  • Highest 8 July, 2025

    92.6 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (1.2 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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