Great South Bay Weather Forecast

    • 57
    • 70

    Becoming Sunny

    • 56
    • 68

    Chance Rain Showers

    • 53
    • 62

    Mostly Sunny

    • 58
    • 65

    Mostly Cloudy

    • 56
    • 64

    Chance Rain Showers

    • 56
    • 63

    Chance Rain Showers

Today 28 May Southwest Suffolk

Mostly sunny. Highs in the upper 70s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 28 May Southwest Suffolk

Mostly clear. Lows in the upper 50s. Northwest Winds 10 to 15 Mph. Gusts up to 25 Mph in the evening.

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Great South Bay Temperature Statistics

May Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 1 May, 2026

    40.6 °F

  • Average May

    60.2 °F

  • Highest 20 May, 2026

    93.7 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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