Great South Bay Weather Forecast

    • 51
    • 65

    Chance Rain Showers

    • 51
    • 65

    Mostly Cloudy

    • 49
    • 63

    Chance Rain Showers

    • 47
    • 54

    Mostly Cloudy

    • 42
    • 55

    Chance Rain Showers

    • 38
    • 48

    Breezy

Today 15 Apr Southwest Suffolk

Mostly sunny. Highs in the upper 70s. Southwest Winds 5 to 10 Mph. Gusts up to 20 Mph this afternoon.

Tonight 15 Apr Southwest Suffolk

Mostly cloudy with a chance of Showers and Thunderstorms. Lows in the mid 50s. Southwest Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain 40 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

April Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 9 April, 2026

    27.6 °F

  • Average April

    47.4 °F

  • Highest 1 April, 2026

    72.6 °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