Great River Weather Forecast

    • 41
    • 56

    Mostly Sunny

    • 43
    • 57

    Chance Rain Showers

    • 48
    • 57

    Chance Rain

    • 49
    • 62

    Rain Likely

    • 45
    • 58

    Chance Rain

    • 45
    • 58

    Partly Sunny

Today 27 Oct Southwest Suffolk

Sunny. Highs in the mid 50s. North Winds 5 to 10 Mph.

Tonight 27 Oct Southwest Suffolk

Mostly clear. Lows in the lower 40s. Northeast Winds 10 to 15 Mph.

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Great River Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (5 miles)

  • Lowest 10 October, 2025

    42.1 °F

  • Average October

    60.6 °F

  • Highest 4 October, 2025

    82 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (5 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    63.2 °F
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