Mundelein Weather Forecast

    • 63
    • 85

    Partly Sunny

    • 63
    • 81

    Slight Chance Thunderstorms

    • 63
    • 78

    Chance Rain Showers

    • 63
    • 82

    Chance Thunderstorms

    • 61
    • 81

    Chance Rain Showers

    • 58
    • 77

    Slight Chance Thunderstorms

Today 18 Sep Lake

Mostly sunny. Patchy fog through mid morning. Highs in the mid 80s Inland, but only in the upper 70s near the lake. Temperature falling into the upper 70s in the afternoon. South Winds around 5 Mph, becoming east in the afternoon.

Tonight 18 Sep Lake

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 60s. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mundelein Temperature Statistics

September Temperature

Chicago / Wheeling, Pal-Waukee Airport (10.6 miles)

  • Lowest 7 September, 2025

    46.9 °F

  • Average September

    65.4 °F

  • Highest 12 September, 2025

    84.9 °F

Climate (2020–Present)

Chicago / Wheeling, Pal-Waukee Airport (10.6 miles)

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  • Average Low 2020–2025

    44.1 °F

  • Average 2020–2025

    52.9 °F

  • Average High 2020–2025

    61.5 °F
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