Smithtown Weather Forecast

    • 47
    • 64

    Becoming Sunny

    • 53
    • 66

    Rain Showers

    • 46
    • 65

    Chance Rain Showers

    • 43
    • 60

    Slight Chance Rain Showers

    • 44
    • 60

    Partly Sunny

    • 46
    • 60

    Mostly Cloudy

Today 20 Oct Northwest Suffolk

Partly sunny. A chance of Showers late this morning. Near steady temperature in the lower 60s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

Tonight 20 Oct Northwest Suffolk

Mostly clear. Lows in the upper 40s. West Winds 15 to 20 Mph.

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Smithtown Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (6.2 miles)

  • Lowest 10 October, 2025

    42.1 °F

  • Average October

    61.3 °F

  • Highest 4 October, 2025

    82 °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

    63.2 °F
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