Great South Bay Weather Forecast

    • 71
    • 75

    Chance Rain Showers

    • 70
    • 77

    Chance Thunderstorms

    • 71
    • 74

    Rain Showers Likely

    • 71
    • 79

    Chance Rain Showers

    • 68
    • 77

    Partly Sunny

    • 66
    • 73

    Partly Sunny

Today 31 Aug Southwest Suffolk

Partly sunny with a 20 percent chance of Showers. Highs in the upper 70s. Northeast Winds around 5 Mph, becoming southeast this afternoon.

Tonight 31 Aug Southwest Suffolk

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms in the Evening, then Showers with a slight chance of Thunderstorms after midnight. Humid with Lows in the upper 60s. South Winds around 5 Mph. Chance of rain 80 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 25 August, 2026

    60.7 °F

  • Average August

    75.9 °F

  • Highest 7 August, 2026

    91.7 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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

  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
Get WillyWeather+ to remove ads