Great South Bay Weather Forecast

    • 65
    • 74

    Partly Sunny

    • 68
    • 78

    Chance Rain Showers

    • 66
    • 78

    Chance Rain Showers

    • 66
    • 79

    Mostly Sunny

    • 66
    • 77

    Partly Sunny

    • 66
    • 75

    Chance Rain Showers

Today 17 Jun Southwest Suffolk

Mostly sunny. Highs in the mid 70s. South Winds 5 to 10 Mph. Gusts up to 20 Mph in the afternoon.

Tonight 17 Jun Southwest Suffolk

Mostly cloudy. A slight chance of Showers after midnight. Lows in the lower 60s. South Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

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

    71.1 °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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