Great South Bay Weather Forecast

    • 58
    • 68

    Increasing Clouds

    • 61
    • 69

    Slight Chance Thunderstorms

    • 56
    • 69

    Partly Sunny

    • 56
    • 66

    Slight Chance Rain Showers

    • 54
    • 63

    Partly Sunny

    • 56
    • 64

    Partly Sunny

Today 26 May Southwest Suffolk

Patchy fog this morning. Mostly sunny. Highs in the mid 70s. Northeast Winds around 5 Mph, becoming south this afternoon.

Tonight 26 May Southwest Suffolk

Mostly cloudy. Lows in the upper 50s. Southwest Winds 5 to 10 Mph.

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Great South Bay Temperature Statistics

May Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 1 May, 2026

    40.6 °F

  • Average May

    60 °F

  • Highest 20 May, 2026

    93.7 °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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