Great River Weather Forecast

    • 59
    • 76

    Increasing Clouds

    • 59
    • 72

    Partly Sunny

    • 62
    • 76

    Mostly Sunny

    • 57
    • 77

    Chance Rain Showers

    • 52
    • 65

    Chance Rain Showers

    • 50
    • 62

    Chance Rain Showers

Today 17 May Southwest Suffolk

Mostly sunny. Highs in the upper 70s. Southwest Winds 10 to 15 Mph.

Tonight 17 May Southwest Suffolk

Mostly clear in the Evening, then becoming partly cloudy. Lows around 60. Southwest Winds 10 to 15 Mph, Diminishing to around 5 Mph after midnight.

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Great River Temperature Statistics

May Temperature

Islip, Long Island Mac Arthur Airport (5 miles)

  • Lowest 1 May, 2026

    40.6 °F

  • Average May

    56.1 °F

  • Highest 5 May, 2026

    67.6 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (5 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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