Lake Ronkonkoma Weather Forecast

    • 68
    • 86

    Increasing Clouds

    • 69
    • 82

    Decreasing Clouds

    • 66
    • 86

    Chance Rain Showers

    • 63
    • 76

    Mostly Cloudy

    • 62
    • 77

    Chance Rain Showers

    • 62
    • 77

    Slight Chance Rain Showers

    • 62
    • 80

    Mostly Sunny

Today 15 Aug Northwest Suffolk

Sunny. Highs in the mid 80s. East Winds 5 to 10 Mph.

Tonight 15 Aug Northwest Suffolk

Mostly clear in the Evening, then becoming mostly cloudy. Humid with Lows in the upper 60s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Ronkonkoma Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (3.1 miles)

  • Lowest 9 August, 2025

    56.6 °F

  • Average August

    73.9 °F

  • Highest 4 August, 2025

    89.7 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (3.1 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63 °F
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