Islip Weather Forecast

    • 71
    • 85

    Mostly Sunny

    • 65
    • 83

    Rain Showers Likely

    • 65
    • 80

    Chance Rain Showers

    • 67
    • 80

    Rain Showers Likely

    • 65
    • 82

    Chance Rain Showers

    • 63
    • 82

    Mostly Sunny

    • 65
    • 80

    Partly Sunny

Today 19 Aug Southwest Suffolk

Sunny. Near steady temperature in the lower 80s. Southwest Winds around 10 Mph.

Tonight 19 Aug Southwest Suffolk

Mostly clear. Humid with Lows around 70. Southwest Winds 5 to 10 Mph.

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Islip Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (6.8 miles)

  • Lowest 4 August, 2026

    63.6 °F

  • Average August

    77.5 °F

  • Highest 7 August, 2026

    91.7 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (6.8 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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