Old Mill Creek Weather Forecast

    • 62
    • 83

    Increasing Clouds

    • 64
    • 79

    Rain Showers Likely

    • 62
    • 78

    Chance Thunderstorms

    • 61
    • 77

    Rain Showers Likely

    • 61
    • 77

    Chance Rain Showers

    • 60
    • 74

    Chance Rain Showers

    • 58
    • 72

    Slight Chance Rain Showers

Today 18 Sep Lake

Mostly sunny. Highs in the mid 80s Inland, but only in the upper 70s near the lake. Southeast Winds 5 to 10 Mph.

Tonight 18 Sep Lake

Mostly clear in the Evening, then becoming partly cloudy. Patchy fog late. Lows in the lower 60s. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Old Mill Creek Temperature Statistics

September Temperature

Chicago/Waukegan Regional Airport (5.6 miles)

  • Lowest 4 September, 2025

    46 °F

  • Average September

    64.8 °F

  • Highest 16 September, 2025

    80.1 °F

Climate (2020–Present)

Chicago/Waukegan Regional Airport (5.6 miles)

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  • Average Low 2020–2025

    42.2 °F

  • Average 2020–2025

    51 °F

  • Average High 2020–2025

    59.6 °F
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