Great South Bay Weather Forecast

    • 51
    • 59

    Breezy

    • 50
    • 64

    Breezy

    • 47
    • 56

    Mostly Sunny

    • 49
    • 57

    Mostly Sunny

    • 51
    • 59

    Mostly Sunny

    • 54
    • 63

    Mostly Sunny

    • 51
    • 60

    Partly Sunny

Today 21 Oct Southwest Suffolk

Mostly sunny. Highs in the upper 50s.

Tonight 21 Oct Southwest Suffolk

Mostly cloudy and breezy. Lows in the upper 40s. North Winds 15 to 25 Mph.

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Great South Bay Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 19 October, 2026

    39 °F

  • Average October

    60.3 °F

  • Highest 14 October, 2026

    82.7 °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

    55.1 °F

  • Average High 2021–2026

    63 °F
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