Great South Bay Weather Forecast

    • 68
    • 78

    Partly Sunny

    • 71
    • 77

    Slight Chance Thunderstorms

    • 73
    • 82

    Slight Chance Thunderstorms

    • 76
    • 86

    Mostly Sunny

    • 74
    • 89

    Chance Rain Showers

    • 73
    • 88

    Chance Rain Showers

Today 29 Jun Southwest Suffolk

Sunny. Highs in the mid 80s. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 29 Jun Southwest Suffolk

Partly cloudy. Patchy fog after midnight. Lows in the upper 60s. Southwest Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

June Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 2 June, 2026

    46.7 °F

  • Average June

    71.3 °F

  • Highest 12 June, 2026

    94.6 °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