Thornton Weather Forecast

    • 63
    • 85

    Mostly Sunny

    • 63
    • 85

    Partly Sunny

    • 64
    • 81

    Chance Rain Showers

    • 64
    • 83

    Chance Thunderstorms

    • 63
    • 81

    Chance Rain Showers

    • 60
    • 78

    Chance Rain Showers

Today 18 Sep Southern Cook

Sunny. Patchy fog through mid morning. Highs in the mid 80s. Southeast Winds around 5 Mph, becoming east in the afternoon.

Tonight 18 Sep Southern Cook

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

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Thornton Temperature Statistics

September Temperature

Lansing Municipal Airport (4.3 miles)

  • Lowest 8 September, 2025

    40.1 °F

  • Average September

    63.7 °F

  • Highest 14 September, 2025

    83.3 °F

Climate (2020–Present)

Lansing Municipal Airport (4.3 miles)

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  • Average Low 2020–2025

    42.3 °F

  • Average 2020–2025

    51.4 °F

  • Average High 2020–2025

    60.3 °F
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