Great South Bay Weather Forecast

    • 63
    • 72

    Chance Thunderstorms

    • 57
    • 80

    Increasing Clouds

    • 59
    • 69

    Mostly Sunny

    • 64
    • 71

    Mostly Sunny

    • 66
    • 72

    Chance Rain Showers

    • 67
    • 76

    Chance Rain Showers

    • 67
    • 76

    Partly Sunny

Today 6 Jun Southwest Suffolk

Mostly sunny. Near steady temperature in the mid 70s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 6 Jun Southwest Suffolk

Mostly cloudy with Showers likely with a chance of Thunderstorms this Evening, then partly cloudy with a slight chance of Showers after midnight. Some Thunderstorms may produce damaging Winds and small hail this evening. Lows in the mid 60s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph, becoming west 5 to 10 Mph after midnight. Chance of rain 70 percent.

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  • 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

    63.9 °F

  • Highest 3 June, 2026

    81.6 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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