St James Weather Forecast

    • 16
    • 30

    Decreasing Clouds

    • 32
    • 35

    Mostly Cloudy

    • 32
    • 48

    Rain Likely

    • 26
    • 40

    Partly Sunny

    • 25
    • 37

    Chance Snow

    • 21
    • 35

    Slight Chance Snow

Today 8 Dec Northwest Suffolk

Partly sunny. Cold with Highs in the upper 20s. North Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 8 Dec Northwest Suffolk

Mostly cloudy in the Evening, then clearing. Lows around 16. North Winds 5 to 10 Mph.

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St James Temperature Statistics

December Temperature

Islip, Long Island Mac Arthur Airport (6.2 miles)

  • Lowest 5 December, 2025

    21 °F

  • Average December

    35.6 °F

  • Highest 1 December, 2025

    46 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (6.2 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    63.1 °F
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