Great South Bay Weather Forecast

    • 73
    • 82

    Chance Thunderstorms

    • 70
    • 81

    Mostly Sunny

    • 71
    • 79

    Mostly Sunny

    • 72
    • 79

    Rain Showers Likely

    • 72
    • 80

    Slight Chance Rain Showers

    • 72
    • 79

    Mostly Sunny

Today 13 Aug Southwest Suffolk

Mostly cloudy with Showers likely with a chance of Thunderstorms in the Morning, then mostly sunny with a slight chance of Showers and Thunderstorms in the afternoon. Humid with Highs in the mid 80s. West Winds 5 to 10 Mph. Chance of rain 60 percent.

Tonight 13 Aug Southwest Suffolk

Partly cloudy. A slight chance of Showers in the evening. Lows in the upper 60s. Northwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 4 August, 2026

    63.6 °F

  • Average August

    78.3 °F

  • Highest 7 August, 2026

    91.7 °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