Great South Bay Weather Forecast

    • 64
    • 73

    Partly Sunny

    • 65
    • 74

    Chance Thunderstorms

    • 61
    • 77

    Slight Chance Rain Showers

    • 59
    • 69

    Mostly Sunny

    • 61
    • 69

    Mostly Sunny

    • 64
    • 72

    Partly Sunny

    • 64
    • 75

    Slight Chance Rain Showers

Today 5 Jun Southwest Suffolk

Mostly sunny. Highs in the mid 80s. Southwest Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 5 Jun Southwest Suffolk

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 60s. Southwest Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening.

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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

    62.4 °F

  • Highest 3 June, 2026

    79 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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