Lemont Weather Forecast

    • 52
    • 68

    Decreasing Clouds

    • 51
    • 70

    Partly Sunny

    • 53
    • 70

    Partly Sunny

    • 54
    • 72

    Mostly Sunny

    • 61
    • 72

    Rain Showers Likely

    • 61
    • 72

    Chance Rain Showers

Today 25 Sep Southern Cook

Mostly cloudy. Isolated Sprinkles late in the morning. Highs in the upper 60s. Northeast Winds around 5 Mph.

Tonight 25 Sep Southern Cook

Partly cloudy in the Evening, then clearing. Lows in the lower 50s. Northeast Winds around 5 Mph.

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Lemont Temperature Statistics

September Temperature

Lewis University Airport (6.8 miles)

  • Lowest 14 September, 2026

    52.6 °F

  • Average September

    72.3 °F

  • Highest 2 September, 2026

    94.6 °F

Climate (2021–2026)

Lewis University Airport (6.8 miles)

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  • Average Low 2021–2026

    43.6 °F

  • Average 2021–2026

    52.5 °F

  • Average High 2021–2026

    61.9 °F
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