Great South Bay Weather Forecast

    • 68
    • 84

    Rain Showers Likely

    • 66
    • 84

    Mostly Sunny

    • 64
    • 81

    Partly Sunny

    • 64
    • 79

    Chance Rain Showers

    • 63
    • 75

    Chance Rain Showers

    • 65
    • 77

    Slight Chance Rain Showers

Today 12 Jun Southwest Suffolk

Mostly sunny. Humid with Highs in the upper 80s. West Winds 5 to 10 Mph. Gusts up to 20 Mph in the afternoon. Heat index Values in the upper 90s.

Tonight 12 Jun Southwest Suffolk

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then partly cloudy with a chance of Showers after midnight. Lows in the upper 60s. West Winds 5 to 10 Mph, becoming northwest after midnight. Chance of rain 40 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

    67.7 °F

  • Highest 5 June, 2026

    88.6 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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