Great South Bay Weather Forecast

    • 70
    • 78

    Chance Thunderstorms

    • 69
    • 77

    Thunderstorms Likely

    • 69
    • 77

    Mostly Cloudy

    • 68
    • 79

    Mostly Sunny

    • 67
    • 77

    Mostly Sunny

    • 69
    • 76

    Mostly Cloudy

    • 71
    • 78

    Slight Chance Thunderstorms

Today 30 Jun Southwest Suffolk

Partly sunny. Highs in the lower 80s. South Winds around 10 Mph.

Tonight 30 Jun Southwest Suffolk

Mostly cloudy. A chance of Showers and Thunderstorms after midnight. Lows in the lower 70s. South Winds 5 to 10 Mph. Chance of rain 50 percent.

Graph Plots Open in Graphs

  • 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, 2025

    49.6 °F

  • Average June

    71.7 °F

  • Highest 24 June, 2025

    101.6 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63 °F
Get WillyWeather+ to remove ads