Great South Bay Weather Forecast

    • 67
    • 73

    Rain Showers Likely

    • 72
    • 78

    Partly Sunny

    • 73
    • 79

    Mostly Cloudy

    • 73
    • 78

    Rain Showers Likely

    • 71
    • 79

    Partly Sunny

    • 72
    • 78

    Mostly Sunny

    • 73
    • 79

    Partly Sunny

Today 30 Jul Southwest Suffolk

Showers likely with a slight chance of Thunderstorms. Highs in the mid 70s. North Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 30 Jul Southwest Suffolk

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms this Evening, then partly cloudy after midnight. Some Thunderstorms may produce heavy rainfall this evening. Lows in the mid 60s. Northwest Winds 5 to 10 Mph. Chance of rain 30 percent.

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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

    75.2 °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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