In June, Thornton typically sees daytime highs of 28.1°C and overnight lows around 10.8°C. Compared to the annual average high of 18.6°C, June runs +9.5°C.
June in Thornton averages a daytime high of 28.1°C and an overnight low of 10.8°C.
June runs +9.5°C compared to Thornton's annual average high of 18.6°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 28.1°C and cooler evenings around 10.8°C.