Smithtown Weather Forecast

    • 73
    • 91

    Slight Chance Thunderstorms

    • 67
    • 84

    Partly Sunny

    • 72
    • 85

    Rain Showers Likely

    • 68
    • 85

    Chance Thunderstorms

    • 67
    • 83

    Partly Sunny

    • 68
    • 83

    Partly Sunny

Today 17 Jul Northwest Suffolk

Mostly cloudy with a chance of Showers and Thunderstorms this Morning, then mostly sunny with a slight chance of Showers and Thunderstorms this afternoon. Highs in the lower 90s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 40 percent. Heat index Values up to 101.

Tonight 17 Jul Northwest Suffolk

Mostly clear in the Evening, then becoming partly cloudy. Humid with Lows in the lower 70s. Southwest Winds 10 to 15 Mph, becoming west after midnight. Gusts up to 25 Mph.

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Smithtown Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (6.2 miles)

  • Lowest 5 July, 2025

    64.7 °F

  • Average July

    77.3 °F

  • Highest 8 July, 2025

    92.6 °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

    55.2 °F

  • Average High 2020–2025

    63 °F
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