Great South Bay Weather Forecast

    • 67
    • 76

    Rain Showers Likely

    • 68
    • 75

    Rain Showers Likely

    • 66
    • 75

    Chance Rain Showers

    • 67
    • 77

    Mostly Sunny

    • 69
    • 77

    Partly Sunny

    • 71
    • 79

    Partly Sunny

Today 25 Jun Southwest Suffolk

Mostly sunny. Highs around 80. East Winds around 5 Mph, increasing to south 10 to 15 Mph this afternoon.

Tonight 25 Jun Southwest Suffolk

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the mid 60s. South Winds 10 to 15 Mph. Chance of rain 50 percent.

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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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