Six Flags - Great America Weather Forecast

    • 48
    • 57

    Rain Showers

    • 46
    • 58

    Rain Showers

    • 40
    • 60

    Chance Rain Showers

    • 41
    • 55

    Mostly Sunny

    • 47
    • 61

    Slight Chance Rain Showers

    • 48
    • 62

    Slight Chance Rain Showers

    • 50
    • 70

    Partly Sunny

Today 30 Apr Lake

Partly cloudy late in the Morning, then becoming mostly cloudy. Scattered Showers late in the afternoon. Highs in the lower 60s Inland, but only in the mid 50s near the lake. Southeast Winds around 10 Mph. Chance of precipitation 40 percent.

Tonight 30 Apr Lake

Scattered Showers in the Evening, then a slight chance of Thunderstorms after midnight. Showers after midnight. Lows in the upper 40s. East Winds around 10 Mph. Chance of precipitation near 100 percent.

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Six Flags - Great America Temperature Statistics

April Temperature

Chicago/Waukegan Regional Airport (5 miles)

  • Lowest 8 April, 2025

    23.8 °F

  • Average April

    47 °F

  • Highest 28 April, 2025

    84 °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

    59.4 °F
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