Great South Bay Weather Forecast

    • 41
    • 44

    Breezy

    • 32
    • 44

    Cloudy

    • 21
    • 38

    Slight Chance Snow

    • 32
    • 36

    Partly Sunny

    • 32
    • 41

    Mostly Cloudy

    • 26
    • 37

    Chance Rain/Snow

Today 13 Jan Southwest Suffolk

Mostly sunny. Highs in the mid 40s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 13 Jan Southwest Suffolk

Mostly cloudy. A slight chance of Showers after midnight. Near steady temperature in the lower 40s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

January Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 1 January, 2026

    21 °F

  • Average January

    35.6 °F

  • Highest 9 January, 2026

    51.1 °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

    55.3 °F

  • Average High 2021–2026

    63.1 °F
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