Great South Bay Weather Forecast

    • 70
    • 78

    Rain Showers

    • 68
    • 77

    Rain Showers

    • 65
    • 77

    Rain Showers Likely

    • 70
    • 78

    Mostly Sunny

    • 72
    • 78

    Mostly Cloudy

    • 72
    • 77

    Chance Rain Showers

    • 72
    • 78

    Slight Chance Rain Showers

Today 28 Jul Southwest Suffolk

Mostly cloudy with a chance of Showers and Thunderstorms. Some Thunderstorms may produce heavy rainfall. Highs in the upper 70s. South Winds around 15 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

Tonight 28 Jul Southwest Suffolk

A chance of Showers and Thunderstorms likely in the Evening, then Showers with a chance of Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall. Humid with Lows around 70. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain near 100 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 26 July, 2026

    57.9 °F

  • Average July

    75.2 °F

  • Highest 3 July, 2026

    98.7 °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