Great South Bay Weather Forecast

    • 71
    • 78

    Slight Chance Thunderstorms

    • 72
    • 80

    Slight Chance Thunderstorms

    • 75
    • 85

    Mostly Sunny

    • 76
    • 90

    Chance Rain Showers

    • 73
    • 85

    Chance Rain Showers

    • 72
    • 81

    Chance Rain Showers

Today 30 Jun Southwest Suffolk

Mostly sunny. Near steady temperature around 80. South Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 30 Jun Southwest Suffolk

Partly cloudy with a slight chance of Showers in the Evening, then mostly cloudy with a slight chance of Showers and Thunderstorms after midnight. Lows around 70. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 20 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

    71.4 °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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