Great South Bay Weather Forecast

    • 59
    • 66

    Windy

    • 60
    • 66

    Rain Showers Likely

    • 59
    • 64

    Rain Showers

    • 62
    • 65

    Rain Showers Likely

    • 61
    • 66

    Slight Chance Rain Showers

    • 61
    • 67

    Partly Sunny

    • 64
    • 68

    Partly Sunny

Today 24 Sep Southwest Suffolk

Partly sunny. Highs in the lower 70s.

Tonight 24 Sep Southwest Suffolk

Mostly cloudy and breezy. Lows in the mid 50s. Northeast Winds 15 to 25 Mph with Gusts up to 40 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 15 September, 2026

    52.6 °F

  • Average September

    70.1 °F

  • Highest 10 September, 2026

    86.6 °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