St James Weather Forecast

    • 68
    • 81

    Mostly Sunny

    • 60
    • 81

    Rain Showers

    • 56
    • 70

    Chance Rain

    • 56
    • 74

    Mostly Sunny

    • 56
    • 72

    Partly Sunny

    • 57
    • 71

    Mostly Cloudy

Today 5 Sep Northwest Suffolk

Sunny. Highs in the lower 80s. Southwest Winds 10 to 15 Mph.

Tonight 5 Sep Northwest Suffolk

Mostly clear. Lows in the upper 60s. South Winds 10 to 15 Mph.

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St James Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (6.2 miles)

  • Lowest 2 September, 2025

    57.9 °F

  • Average September

    67.3 °F

  • Highest 1 September, 2025

    77 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (6.2 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63.1 °F
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