Six Flags - Great America Weather Forecast

    • 72
    • 84

    Decreasing Clouds

    • 78
    • 93

    Partly Sunny

    • 71
    • 94

    Thunderstorms Likely

    • 69
    • 81

    Chance Thunderstorms

    • 70
    • 85

    Slight Chance Thunderstorms

    • 71
    • 88

    Mostly Sunny

Today 22 Jul Lake

Partly cloudy late in the Morning, then becoming mostly sunny. Highs in the mid 80s Inland, but only in the lower 80s near the lake. Southeast Winds 5 to 10 Mph.

Tonight 22 Jul Lake

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 70s. Southeast Winds 5 to 10 Mph.

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Six Flags - Great America Temperature Statistics

July Temperature

Chicago/Waukegan Regional Airport (5 miles)

  • Lowest 17 July, 2025

    55.7 °F

  • Average July

    74.8 °F

  • Highest 5 July, 2025

    93.7 °F

Climate (2020–Present)

Chicago/Waukegan Regional Airport (5 miles)

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  • Average Low 2020–2025

    42.2 °F

  • Average 2020–2025

    51 °F

  • Average High 2020–2025

    59.5 °F
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