Great South Bay Weather Forecast

    • 68
    • 80

    Chance Thunderstorms

    • 68
    • 77

    Mostly Sunny

    • 68
    • 77

    Mostly Sunny

    • 68
    • 76

    Partly Sunny

    • 71
    • 77

    Slight Chance Rain Showers

    • 71
    • 80

    Chance Rain Showers

Today 22 Jul Southwest Suffolk

Partly sunny. A chance of Showers with a slight chance of Thunderstorms this Morning, then a slight chance of Showers and Thunderstorms this afternoon. Highs in the lower 80s. Southwest Winds 15 to 20 Mph. Chance of rain 50 percent.

Tonight 22 Jul Southwest Suffolk

Mostly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the mid 60s. West Winds 5 to 10 Mph, becoming north after midnight. Gusts up to 20 Mph. Chance of rain 20 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 20 July, 2026

    61 °F

  • Average July

    76.2 °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

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
Get WillyWeather+ to remove ads