Waukegan Weather Forecast

    • 62
    • 71

    Rain Showers Likely

    • 62
    • 71

    Rain Showers

    • 60
    • 76

    Rain Showers

    • 56
    • 69

    Chance Rain Showers

    • 55
    • 64

    Chance Rain Showers

    • 56
    • 65

    Slight Chance Rain Showers

Today 17 Sep Lake

Cloudy. A chance of Showers late in the Morning, then a slight chance of Showers in the afternoon. Highs in the lower 70s. Northeast Winds 5 to 10 Mph. Chance of precipitation 40 percent.

Tonight 17 Sep Lake

Mostly cloudy. Lows in the lower 60s. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Waukegan Temperature Statistics

September Temperature

Chicago/Waukegan Regional Airport (3.7 miles)

  • Lowest 14 September, 2026

    46 °F

  • Average September

    71.9 °F

  • Highest 1 September, 2026

    93.7 °F

Climate (2021–2026)

Chicago/Waukegan Regional Airport (3.7 miles)

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  • Average Low 2021–2026

    42.2 °F

  • Average 2021–2026

    51 °F

  • Average High 2021–2026

    59.7 °F
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