Lemont Weather Forecast

    • 61
    • 87

    Mostly Sunny

    • 61
    • 85

    Mostly Sunny

    • 63
    • 86

    Mostly Sunny

    • 64
    • 88

    Mostly Cloudy

    • 61
    • 80

    Chance Rain Showers

    • 59
    • 73

    Chance Rain Showers

Today 15 Sep Southern Cook

Sunny. Highs in the mid 80s. East Winds 5 to 10 Mph.

Tonight 15 Sep Southern Cook

Clear. Lows in the lower 60s. East Winds around 5 Mph.

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Lemont Temperature Statistics

September Temperature

Lewis University Airport (6.8 miles)

  • Lowest 7 September, 2025

    44.6 °F

  • Average September

    61.3 °F

  • Highest 12 September, 2025

    84.2 °F

Climate (2020–Present)

Lewis University Airport (6.8 miles)

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  • Average Low 2020–2025

    43.4 °F

  • Average 2020–2025

    52.4 °F

  • Average High 2020–2025

    61.7 °F
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