Great South Bay Weather Forecast

    • 62
    • 74

    Mostly Sunny

    • 63
    • 73

    Partly Sunny

    • 67
    • 80

    Chance Rain Showers

    • 66
    • 76

    Chance Rain Showers

    • 65
    • 78

    Mostly Sunny

    • 66
    • 77

    Partly Sunny

Today 16 Jun Southwest Suffolk

Sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph, becoming southwest 10 to 15 Mph in the afternoon. Gusts up to 25 Mph.

Tonight 16 Jun Southwest Suffolk

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 60s. Southwest Winds 10 to 15 Mph. Gusts up to 25 Mph in the evening.

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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

    70.8 °F

  • Highest 12 June, 2026

    94.6 °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

    55.2 °F

  • Average High 2021–2026

    63 °F
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