Great South Bay Weather Forecast

    • 77
    • 88

    Thunderstorms

    • 73
    • 88

    Chance Thunderstorms

    • 70
    • 81

    Rain Showers Likely

    • 70
    • 77

    Rain Showers Likely

    • 70
    • 76

    Chance Rain Showers

    • 72
    • 76

    Partly Sunny

    • 73
    • 79

    Partly Sunny

Today 3 Jul Southwest Suffolk

Sunny with scattered Showers and Thunderstorms. Some Thunderstorms may produce gusty Winds. Hot with Highs in the mid 90s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 30 percent. Heat index Values up to 109.

Tonight 3 Jul Southwest Suffolk

Mostly cloudy with scattered Showers and Thunderstorms this Evening, then partly cloudy with isolated Showers and Thunderstorms after midnight. Some Thunderstorms may produce gusty Winds this evening. Lows in the upper 70s. West Winds 10 to 15 Mph, Diminishing to around 5 Mph after midnight. Chance of rain 30 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 1 July, 2026

    69.1 °F

  • Average July

    76.9 °F

  • Highest 1 July, 2026

    84 °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

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63 °F
Get WillyWeather+ to remove ads