Thornton Weather Forecast

    • 57
    • 62

    Mostly Cloudy

    • 54
    • 68

    Mostly Cloudy

    • 51
    • 67

    Partly Sunny

    • 54
    • 68

    Mostly Cloudy

    • 53
    • 68

    Partly Sunny

    • 55
    • 71

    Mostly Sunny

    • 61
    • 75

    Rain Showers Likely

Today 23 Sep Southern Cook

Showers likely. Highs in the lower 70s. Chance of precipitation 60 percent.

Tonight 23 Sep Southern Cook

Cloudy. A chance of Sprinkles late in the evening. A slight chance of drizzle after midnight. Lows in the upper 50s. Northeast Winds 5 to 10 Mph.

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Thornton Temperature Statistics

September Temperature

Lansing Municipal Airport (4.3 miles)

  • Lowest 14 September, 2026

    47.3 °F

  • Average September

    72 °F

  • Highest 2 September, 2026

    94.6 °F

Climate (2021–2026)

Lansing Municipal Airport (4.3 miles)

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  • Average Low 2021–2026

    42.4 °F

  • Average 2021–2026

    51.5 °F

  • Average High 2021–2026

    60.4 °F
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