Great South Bay Weather Forecast

    • 54
    • 60

    Rain Showers Likely

    • 52
    • 59

    Rain Showers

    • 53
    • 61

    Chance Rain Showers

    • 56
    • 63

    Mostly Sunny

    • 55
    • 68

    Partly Sunny

    • 56
    • 64

    Partly Sunny

Today 13 May Southwest Suffolk

Mostly cloudy this Morning, then becoming partly sunny. Breezy with Highs in the upper 60s. South Winds 15 to 25 Mph with Gusts up to 40 Mph.

Tonight 13 May Southwest Suffolk

Mostly cloudy. Showers likely after midnight. Breezy with Lows in the lower 50s. South Winds 20 to 25 Mph with Gusts up to 40 Mph, Diminishing to 10 to 15 Mph with Gusts up to 25 Mph after midnight. Chance of rain 70 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

    56 °F

  • Highest 5 May, 2026

    67.6 °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