Great South Bay Weather Forecast

    • 61
    • 76

    Partly Sunny

    • 63
    • 71

    Partly Sunny

    • 64
    • 71

    Slight Chance Thunderstorms

    • 68
    • 77

    Chance Rain Showers

    • 67
    • 78

    Chance Rain Showers

    • 67
    • 79

    Mostly Sunny

Today 15 Jun Southwest Suffolk

Sunny. A chance of Showers in the morning. Highs in the upper 70s. Northwest Winds 5 to 10 Mph. Gusts up to 20 Mph in the morning. Chance of rain 40 percent.

Tonight 15 Jun Southwest Suffolk

Mostly clear. Lows in the upper 50s. Northwest Winds 5 to 10 Mph.

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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

    69.9 °F

  • Highest 11 June, 2026

    92.6 °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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