Fair Harbor Weather Forecast

    • 70
    • 77

    Chance Rain Showers

    • 60
    • 78

    Partly Sunny

    • 62
    • 68

    Mostly Cloudy

    • 65
    • 71

    Rain Showers

    • 62
    • 69

    Slight Chance Rain Showers

    • 59
    • 64

    Breezy

    • 59
    • 62

    Breezy

Today 17 Sep Southwest Suffolk

Partly sunny with a 30 percent chance of Showers. Breezy with Highs in the mid 60s.

Tonight 17 Sep Southwest Suffolk

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Humid with Lows in the upper 60s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

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Fair Harbor Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (11.2 miles)

  • Lowest 15 September, 2026

    53.1 °F

  • Average September

    71.5 °F

  • Highest 10 September, 2026

    86.6 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (11.2 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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