Lake Grove Weather Forecast

    • 62
    • 74

    Rain Showers Likely

    • 61
    • 76

    Mostly Cloudy

    • 64
    • 81

    Mostly Sunny

    • 66
    • 81

    Mostly Sunny

    • 67
    • 80

    Chance Rain Showers

    • 63
    • 81

    Slight Chance Rain Showers

Today 20 Aug Northwest Suffolk

Partly sunny with a chance of Showers in the Morning, then mostly cloudy with a chance of Showers and Thunderstorms in the afternoon. Highs in the mid 70s. East Winds 10 to 15 Mph. Chance of rain 50 percent.

Tonight 20 Aug Northwest Suffolk

Showers likely with a chance of Thunderstorms. Lows in the lower 60s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Grove Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (3.7 miles)

  • Lowest 9 August, 2025

    56.6 °F

  • Average August

    75.2 °F

  • Highest 4 August, 2025

    89.7 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (3.7 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63.1 °F
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