Great South Bay Weather Forecast

    • 69
    • 75

    Becoming Sunny

    • 72
    • 77

    Chance Rain Showers

    • 70
    • 77

    Chance Rain Showers

    • 71
    • 75

    Chance Thunderstorms

    • 72
    • 77

    Chance Rain Showers

    • 70
    • 79

    Chance Rain Showers

Today 29 Aug Southwest Suffolk

Mostly sunny. Highs in the upper 70s. North Winds 10 to 15 Mph, becoming northwest around 5 Mph this afternoon.

Tonight 29 Aug Southwest Suffolk

Mostly clear. Lows in the lower 60s. Southwest Winds 5 to 10 Mph.

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Great South Bay Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 25 August, 2026

    61 °F

  • Average August

    76 °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

    47.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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