Great South Bay Weather Forecast

    • 53
    • 68

    Breezy

    • 52
    • 60

    Breezy

    • 57
    • 66

    Partly Sunny

    • 55
    • 65

    Chance Rain Showers

    • 55
    • 63

    Chance Rain Showers

    • 56
    • 64

    Partly Sunny

Today 29 May Southwest Suffolk

Sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph, becoming west 10 to 15 Mph with Gusts up to 25 Mph this afternoon.

Tonight 29 May Southwest Suffolk

Mostly cloudy in the Evening, then becoming partly cloudy. A 20 percent chance of Showers. Lows in the mid 50s. Southwest Winds 10 to 15 Mph, becoming northwest 15 to 20 Mph after midnight. Gusts up to 30 Mph.

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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

    60.6 °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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