Great South Bay Weather Forecast

    • 72
    • 79

    Partly Sunny

    • 71
    • 80

    Mostly Cloudy

    • 73
    • 80

    Rain Showers Likely

    • 73
    • 79

    Partly Sunny

    • 72
    • 79

    Mostly Sunny

    • 73
    • 79

    Partly Sunny

Today 31 Jul Southwest Suffolk

Sunny. Highs in the lower 80s. Northwest Winds around 5 Mph, becoming southwest this afternoon.

Tonight 31 Jul Southwest Suffolk

Partly cloudy. A slight chance of Showers and Thunderstorms this evening. Patchy fog after midnight. Lows in the upper 60s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 24 July, 2026

    58.6 °F

  • Average July

    75.1 °F

  • Highest 3 July, 2026

    98.7 °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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