Heckscher State Park Weather Forecast

    • 71
    • 78

    Rain Showers

    • 67
    • 80

    Rain Showers Likely

    • 66
    • 77

    Mostly Sunny

    • 67
    • 75

    Partly Sunny

    • 68
    • 76

    Partly Sunny

    • 70
    • 77

    Partly Sunny

Today 21 Jul Southwest Suffolk

Showers likely with a chance of Thunderstorms in the afternoon. Humid with Highs around 80. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 70 percent.

Tonight 21 Jul Southwest Suffolk

Showers with a chance of Thunderstorms in the Evening, then Showers likely with a slight chance of Thunderstorms after midnight. Humid with Lows in the lower 70s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 90 percent.

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Heckscher State Park Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (6.2 miles)

  • Lowest 7 July, 2026

    63.6 °F

  • Average July

    76.8 °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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