Smithtown Weather Forecast

    • 67
    • 80

    Increasing Clouds

    • 71
    • 79

    Rain Showers

    • 64
    • 81

    Chance Rain Showers

    • 65
    • 84

    Mostly Sunny

    • 67
    • 82

    Mostly Sunny

    • 68
    • 84

    Mostly Sunny

Today 20 Jul Northwest Suffolk

Sunny. Highs around 80. Northeast Winds around 5 Mph, becoming southeast this afternoon.

Tonight 20 Jul Northwest Suffolk

Mostly clear in the Evening, then becoming mostly cloudy. Lows in the upper 60s. South Winds 5 to 10 Mph.

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Smithtown Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (6.2 miles)

  • Lowest 7 July, 2026

    63.6 °F

  • Average July

    77 °F

  • Highest 3 July, 2026

    98.7 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (6.2 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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