Great South Bay Weather Forecast

    • 72
    • 79

    Mostly Sunny

    • 73
    • 79

    Rain Showers Likely

    • 72
    • 82

    Slight Chance Rain Showers

    • 72
    • 80

    Mostly Sunny

    • 74
    • 80

    Partly Sunny

Today 15 Aug Southwest Suffolk

Sunny. Highs in the lower 80s. Northeast Winds 5 to 10 Mph. Gusts up to 20 Mph in the morning.

Tonight 15 Aug Southwest Suffolk

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 60s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 4 August, 2026

    63.6 °F

  • Average August

    78.4 °F

  • Highest 7 August, 2026

    91.7 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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