Great South Bay Weather Forecast

    • 16
    • 23

    Blustery

    • 14
    • 22

    Partly Sunny

    • 12
    • 21

    Partly Sunny

    • 12
    • 20

    Partly Sunny

    • 20
    • 24

    Chance Snow

    • 23
    • 29

    Chance Snow

Today 27 Jan Southwest Suffolk

Sunny this Morning, then becoming partly sunny. Brisk, cold with Highs in the lower 20s. West Winds 15 to 25 Mph. Wind chill Values as low as 1 below.

Tonight 27 Jan Southwest Suffolk

Mostly clear. Light freezing spray. Brisk. Near steady temperature around 15. Northwest Winds 20 to 25 Mph with Gusts up to 35 Mph. Wind chill Values as low as 1 below.

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Great South Bay Temperature Statistics

January Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 21 January, 2026

    8.7 °F

  • Average January

    34.2 °F

  • Highest 9 January, 2026

    51.7 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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