Six Flags - Great America Weather Forecast

    • 31
    • 62

    Chance Rain/Snow

    • 28
    • 41

    Chance Snow Showers

    • 40
    • 60

    Partly Sunny

    • 43
    • 57

    Mostly Cloudy

    • 30
    • 63

    Rain

    • 25
    • 40

    Chance Snow

Today 15 Mar Lake

Partly cloudy in the Morning, then becoming mostly cloudy. Windy with Highs in the lower 60s. Temperature falling into the mid 50s in the afternoon. South Winds 20 to 30 Mph through mid Morning, increasing to southwest 25 to 35 Mph late in the Morning, then Diminishing to 20 to 30 Mph early in the Afternoon, Diminishing to 15 to 25 Mph late in the afternoon. Gusts up to 55 Mph.

Tonight 15 Mar Lake

Mostly cloudy. A chance of rain and snow Showers after midnight. Breezy with Lows in the lower 30s. West Winds 10 to 20 Mph with Gusts up to 30 Mph early in the Evening, becoming 10 to 15 Mph with Gusts up to 30 Mph in the late evening and overnight. Chance of precipitation 30 percent.

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Six Flags - Great America Temperature Statistics

March Temperature

Chicago/Waukegan Regional Airport (5 miles)

  • Lowest 2 March, 2025

    13.7 °F
  • Average March

    38.9 °F
  • Highest 10 March, 2025

    69.1 °F

Climate (2020–Present)

Chicago/Waukegan Regional Airport (5 miles)

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  • Average Low 2020–2025

    42.2 °F
  • Average 2020–2025

    50.8 °F
  • Average High 2020–2025

    59.2 °F
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