Lemont Weather Forecast

    • 50
    • 73

    Mostly Sunny

    • 62
    • 80

    Mostly Cloudy

    • 60
    • 79

    Thunderstorms

    • 65
    • 81

    Slight Chance Thunderstorms

    • 64
    • 88

    Chance Thunderstorms

    • 57
    • 80

    Slight Chance Rain Showers

Today 11 May Southern Cook

Sunny. Highs in the lower 70s. Northeast Winds around 10 Mph.

Tonight 11 May Southern Cook

Mostly clear through the early Overnight, then becoming partly cloudy. Lows in the upper 40s. East Winds 5 to 10 Mph.

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Lemont Temperature Statistics

May Temperature

Lewis University Airport (6.8 miles)

  • Lowest 9 May, 2025

    37.4 °F

  • Average May

    55.2 °F

  • Highest 7 May, 2025

    77.6 °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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