Great South Bay Weather Forecast

    • 64
    • 76

    Increasing Clouds

    • 64
    • 74

    Mostly Sunny

    • 69
    • 78

    Mostly Sunny

    • 71
    • 78

    Mostly Cloudy

    • 71
    • 80

    Rain Showers Likely

    • 71
    • 81

    Slight Chance Thunderstorms

    • 72
    • 82

    Partly Sunny

Today 24 Jul Southwest Suffolk

Sunny. Near steady temperature in the upper 70s. Southeast Winds 5 to 10 Mph.

Tonight 24 Jul Southwest Suffolk

Mostly cloudy. Lows in the lower 60s. Southeast Winds 5 to 10 Mph, becoming east after midnight.

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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 20 July, 2026

    60.7 °F

  • Average July

    76.1 °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

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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