In October, Thornton typically sees daytime highs of 20.3°C and overnight lows around 2.6°C. Compared to the annual average high of 18.6°C, October runs +1.7°C.
October in Thornton averages a daytime high of 20.3°C and an overnight low of 2.6°C.
October runs +1.7°C compared to Thornton's annual average high of 18.6°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 20.3°C and cooler evenings around 2.6°C.