Great South Bay Weather Forecast

    • 66
    • 75

    Decreasing Clouds

    • 68
    • 77

    Partly Sunny

    • 70
    • 78

    Slight Chance Rain Showers

    • 74
    • 83

    Mostly Sunny

    • 76
    • 87

    Mostly Sunny

    • 75
    • 91

    Partly Sunny

Today 28 Jun Southwest Suffolk

Mostly sunny. Highs around 80. Southeast Winds 5 to 10 Mph.

Tonight 28 Jun Southwest Suffolk

Partly cloudy in the Evening, then becoming mostly cloudy. Patchy fog after midnight. Lows in the mid 60s. Southeast Winds around 5 Mph in the Evening, becoming light and variable.

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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

    71.2 °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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