Great South Bay Weather Forecast

    • 43
    • 47

    Increasing Clouds

    • 47
    • 54

    Mostly Cloudy

    • 40
    • 50

    Chance Rain

    • 45
    • 49

    Partly Sunny

    • 46
    • 53

    Partly Sunny

    • 49
    • 54

    Chance Rain

Today 20 Nov Southwest Suffolk

Partly sunny. Highs in the upper 40s. North Winds around 5 Mph.

Tonight 20 Nov Southwest Suffolk

Mostly clear in the Evening, then becoming mostly cloudy. Lows in the mid 30s. Light and variable Winds, becoming northwest around 5 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

November Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 7 November, 2025

    33.1 °F

  • Average November

    49.6 °F

  • Highest 8 November, 2025

    66.9 °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

    55.3 °F

  • Average High 2020–2025

    63.2 °F
Get WillyWeather+ to remove ads