Great South Bay Weather Forecast

    • 62
    • 73

    Rain Showers

    • 63
    • 82

    Mostly Sunny

    • 66
    • 78

    Partly Sunny

    • 69
    • 79

    Chance Rain Showers

    • 69
    • 76

    Chance Rain Showers

    • 70
    • 79

    Mostly Sunny

Today 23 Jun Southwest Suffolk

Showers with a chance of Thunderstorms. Highs in the lower 70s. Southwest Winds 5 to 10 Mph, becoming northwest this afternoon. Gusts up to 20 Mph. Chance of rain 90 percent.

Tonight 23 Jun Southwest Suffolk

Cloudy with Showers with a slight chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the lower 60s. North Winds 5 to 10 Mph. Gusts up to 20 Mph after midnight. Chance of rain 90 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

    71.4 °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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