Six Flags - Great America Weather Forecast

    • 63
    • 79

    Partly Sunny

    • 68
    • 81

    Chance Thunderstorms

    • 59
    • 79

    Mostly Cloudy

    • 59
    • 77

    Partly Sunny

    • 60
    • 77

    Partly Sunny

    • 63
    • 81

    Slight Chance Rain Showers

Today 19 Aug Lake

Partly cloudy until late afternoon then clearing. Patchy fog during the Predawn hours. Highs around 80. Northwest Winds 5 to 10 Mph during the Predawn hours shifting to the east in the afternoon.

Tonight 19 Aug Lake

Clear in the evening then becoming partly cloudy. Lows in the lower 60s. East Winds around 5 Mph.

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Six Flags - Great America Temperature Statistics

August Temperature

Chicago/Waukegan Regional Airport (5 miles)

  • Lowest 1 August, 2019

    52 °F
  • Average August

    70.4 °F
  • Highest 5 August, 2019

    88 °F

Climate (2010–Present)

Chicago/Waukegan Regional Airport (5 miles)

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  • Average Low 2010–Present

    40.9 °F
  • Average 2010–Present

    49.2 °F
  • Average High 2010–Present

    57 °F
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