Great South Bay Weather Forecast

    • 60
    • 63

    Rain

    • 64
    • 67

    Rain Showers

    • 60
    • 66

    Rain Showers Likely

    • 62
    • 68

    Partly Sunny

    • 64
    • 69

    Partly Sunny

    • 65
    • 71

    Partly Sunny

    • 63
    • 71

    Mostly Cloudy

Today 26 Sep Southwest Suffolk

Partly sunny. A chance of Showers in the morning. Highs in the upper 60s. Chance of rain 30 percent.

Tonight 26 Sep Southwest Suffolk

Rain with isolated Thunderstorms. Rain may be heavy at Times after midnight. Strong Winds with Lows in the upper 50s. North Winds 35 to 45 Mph with Gusts up to 60 Mph. Chance of rain near 100 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 15 September, 2026

    52.6 °F

  • Average September

    69.4 °F

  • Highest 10 September, 2026

    86.6 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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