Six Flags - Great America Weather Forecast

    • 23
    • 45

    Breezy

    • 30
    • 47

    Partly Sunny

    • 24
    • 41

    Mostly Sunny

    • 31
    • 50

    Partly Sunny

    • 25
    • 39

    Mostly Cloudy

    • 27
    • 34

    Chance Rain

    • 21
    • 42

    Slight Chance Rain

Today 27 Jan Lake

Windy. Mostly sunny in the late morning and early Afternoon, then becoming mostly cloudy. Highs in the mid 40s. Southwest Winds 20 to 30 Mph with Gusts up to 45 Mph.

Tonight 27 Jan Lake

Mostly cloudy early in the afternoon then clearing. Lows in the mid 20s. West Winds 15 to 25 Mph with Gusts up to 45 Mph early in the Afternoon, becoming northwest 5 to 10 Mph with Gusts up to 25 Mph after midnight.

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Six Flags - Great America Temperature Statistics

January Temperature

Chicago/Waukegan Regional Airport (5 miles)

  • Lowest 21 January, 2025

    -7.1 °F

  • Average January

    19.2 °F

  • Highest 17 January, 2025

    49.6 °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

    59.2 °F
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