Great South Bay Weather Forecast

    • 68
    • 78

    Chance Thunderstorms

    • 68
    • 79

    Chance Thunderstorms

    • 68
    • 80

    Mostly Sunny

    • 67
    • 77

    Chance Rain Showers

    • 65
    • 74

    Chance Rain Showers

    • 64
    • 71

    Chance Rain Showers

Today 11 Jun Southwest Suffolk

Partly sunny. Patchy fog in the morning. A slight chance of Showers in the afternoon. Humid with Highs in the upper 80s. Southwest Winds 10 to 15 Mph. Chance of rain 20 percent. Heat index Values in the upper 90s.

Tonight 11 Jun Southwest Suffolk

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then a chance of Showers after midnight. Humid with Lows around 70. West Winds 5 to 10 Mph. Chance of rain 50 percent.

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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

    67.9 °F

  • Highest 5 June, 2026

    88.6 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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