Great South Bay Weather Forecast

    • 51
    • 59

    Slight Chance Rain Showers

    • 57
    • 65

    Partly Sunny

    • 54
    • 65

    Partly Sunny

    • 55
    • 63

    Slight Chance Rain Showers

    • 56
    • 64

    Partly Sunny

    • 60
    • 67

    Partly Sunny

Today 30 May Southwest Suffolk

Mostly sunny and breezy. Highs in the lower 60s. North Winds 15 to 25 Mph with Gusts up to 40 Mph.

Tonight 30 May Southwest Suffolk

Mostly clear. Lows in the upper 40s. Northeast Winds 15 to 20 Mph with Gusts up to 30 Mph, becoming north around 5 Mph after midnight.

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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

    60.9 °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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