Six Flags - Great America Weather Forecast

    • 59
    • 76

    Partly Sunny

    • 64
    • 80

    Partly Sunny

    • 66
    • 90

    Thunderstorms Likely

    • 63
    • 80

    Thunderstorms Likely

    • 60
    • 80

    Slight Chance Thunderstorms

    • 67
    • 85

    Slight Chance Thunderstorms

Today 15 Jun Lake

Partly cloudy through mid Morning, then becoming mostly cloudy. Highs in the upper 70s Inland, but only around 70 near the lake. East Winds 5 to 10 Mph.

Tonight 15 Jun Lake

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the upper 50s. East Winds around 5 Mph.

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Six Flags - Great America Temperature Statistics

June Temperature

Chicago/Waukegan Regional Airport (5 miles)

  • Lowest 1 June, 2025

    38.6 °F

  • Average June

    64.7 °F

  • Highest 11 June, 2025

    91.7 °F

Climate (2020–Present)

Chicago/Waukegan Regional Airport (5 miles)

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  • Average Low 2020–2025

    42.2 °F

  • Average 2020–2025

    50.9 °F

  • Average High 2020–2025

    59.4 °F
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