Great South Bay Weather Forecast

    • 66
    • 79

    Chance Rain Showers

    • 65
    • 81

    Mostly Cloudy

    • 68
    • 82

    Partly Sunny

    • 72
    • 79

    Chance Rain Showers

    • 74
    • 81

    Chance Rain Showers

    • 76
    • 85

    Mostly Sunny

Today 27 Jun Southwest Suffolk

Mostly cloudy with a 50 percent chance of Showers. Highs in the upper 70s. Southwest Winds 10 to 15 Mph.

Tonight 27 Jun Southwest Suffolk

Mostly cloudy with a 50 percent chance of Showers. Lows in the mid 60s. South Winds 5 to 10 Mph, becoming northeast after midnight.

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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)

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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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