Great South Bay Weather Forecast

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    • 77

    Increasing Clouds

    • 67
    • 73

    Rain Showers

    • 67
    • 78

    Rain Showers Likely

    • 68
    • 76

    Mostly Sunny

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    • 76

    Chance Rain Showers

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    Slight Chance Rain Showers

Today 21 Jun Southwest Suffolk

Sunny. Highs in the lower 80s. West Winds around 5 Mph, increasing to southwest 10 to 15 Mph this afternoon.

Tonight 21 Jun Southwest Suffolk

Partly cloudy. Lows in the mid 60s. Southwest Winds 5 to 10 Mph, becoming northwest 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

    70.8 °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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