Great South Bay Weather Forecast

    • 72
    • 77

    Chance Rain Showers

    • 70
    • 78

    Slight Chance Thunderstorms

    • 70
    • 77

    Partly Sunny

    • 73
    • 78

    Partly Sunny

    • 72
    • 80

    Partly Sunny

    • 72
    • 78

    Mostly Cloudy

Today 27 Aug Southwest Suffolk

Partly sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs in the upper 70s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

Tonight 27 Aug Southwest Suffolk

Mostly cloudy with a slight chance of Showers and Thunderstorms. Humid with Lows in the upper 60s. South Winds 10 to 15 Mph. Gusts up to 25 Mph in the evening. Chance of rain 20 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

    61 °F

  • Average August

    76.3 °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