Great South Bay Weather Forecast

    • 60
    • 68

    Slight Chance Rain Showers

    • 57
    • 70

    Mostly Sunny

    • 57
    • 67

    Chance Rain Showers

    • 53
    • 67

    Partly Sunny

    • 56
    • 65

    Partly Sunny

    • 55
    • 65

    Partly Sunny

Today 27 May Southwest Suffolk

Mostly cloudy with a 20 percent chance of Showers. Highs in the upper 70s. Southwest Winds 10 to 15 Mph.

Tonight 27 May Southwest Suffolk

Mostly cloudy with a slight chance of Showers in the Evening, then partly cloudy after midnight. Lows in the lower 60s. West Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming north after midnight. Chance of rain 20 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

May Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 1 May, 2026

    40.6 °F

  • Average May

    59.8 °F

  • Highest 20 May, 2026

    93.7 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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

  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
Get WillyWeather+ to remove ads