In October, Boulder typically sees daytime highs of 15.2°C and overnight lows around -0.3°C. Compared to the annual average high of 13.6°C, October runs +1.6°C.
October in Boulder averages a daytime high of 15.2°C and an overnight low of -0.3°C.
October runs +1.6°C compared to Boulder's annual average high of 13.6°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 15.2°C and cooler evenings around -0.3°C.