Great South Bay Weather Forecast

    • 66
    • 78

    Breezy

    • 66
    • 77

    Mostly Sunny

    • 68
    • 73

    Rain Showers

    • 67
    • 77

    Mostly Sunny

    • 68
    • 76

    Partly Sunny

    • 68
    • 75

    Partly Sunny

Today 20 Jun Southwest Suffolk

Sunny. Highs around 80. West Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 20 Jun Southwest Suffolk

Mostly clear. Lows in the mid 60s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph, Diminishing to around 5 Mph after midnight.

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Great South Bay Temperature Statistics

June Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 2 June, 2026

    46.7 °F

  • Average June

    70.6 °F

  • Highest 12 June, 2026

    94.6 °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 °F
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