Great River Weather Forecast

    • 71
    • 90

    Rain Showers Likely

    • 67
    • 82

    Rain Showers

    • 66
    • 76

    Rain Showers

    • 67
    • 79

    Chance Thunderstorms

    • 69
    • 80

    Partly Sunny

    • 72
    • 83

    Chance Rain Showers

Today 4 Jul Southwest Suffolk

Partly sunny. A chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may produce gusty Winds this afternoon. Highs in the lower 90s. West Winds 10 to 15 Mph. Chance of rain 50 percent. Heat index Values up to 102.

Tonight 4 Jul Southwest Suffolk

Mostly cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Some Thunderstorms may produce gusty Winds in the evening. Humid with Lows in the lower 70s. West Winds 5 to 10 Mph. Chance of rain 70 percent.

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Great River Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (5 miles)

  • Lowest 1 July, 2026

    69.7 °F

  • Average July

    80.2 °F

  • Highest 2 July, 2026

    93.9 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (5 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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