Great River Weather Forecast

    • 16
    • 33

    Slight Chance Snow Showers

    • 21
    • 29

    Increasing Clouds

    • 27
    • 34

    Partly Sunny

    • 31
    • 43

    Partly Sunny

    • 45
    • 52

    Rain

    • 23
    • 51

    Partly Sunny

    • 36
    • 42

    Chance Rain

Today 14 Dec Southwest Suffolk

Mostly cloudy with a 50 percent chance of snow Showers. Blustery with Highs in the lower 30s. Northwest Winds 15 to 25 Mph with Gusts up to 40 Mph.

Tonight 14 Dec Southwest Suffolk

Partly cloudy with a slight chance of snow Showers this Evening, then mostly clear after midnight. Blustery, cooler with Lows around 17. Northwest Winds 15 to 25 Mph with Gusts up to 45 Mph. Chance of snow 20 percent. Wind chill Values as low as 1 below.

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Great River Temperature Statistics

December Temperature

Islip, Long Island Mac Arthur Airport (5 miles)

  • Lowest 5 December, 2025

    21 °F

  • Average December

    35.2 °F

  • Highest 10 December, 2025

    50 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (5 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    63.1 °F
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