Great South Bay Weather Forecast

    • 68
    • 74

    Rain Showers

    • 66
    • 76

    Rain Showers Likely

    • 66
    • 79

    Mostly Sunny

    • 68
    • 79

    Chance Thunderstorms

    • 69
    • 76

    Chance Thunderstorms

    • 69
    • 78

    Partly Sunny

Today 22 Jun Southwest Suffolk

Mostly cloudy. A slight chance of Showers this Morning, then a chance of Showers and Thunderstorms this afternoon. Highs in the mid 70s. Southeast Winds 10 to 15 Mph. Gusts up to 25 Mph this afternoon. Chance of rain 50 percent.

Tonight 22 Jun Southwest Suffolk

Showers likely with a chance of Thunderstorms in the Evening, then Showers with a slight chance of Thunderstorms after midnight. Near steady temperature in the upper 60s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

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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