In August, Boulder typically sees daytime highs of 24.8°C and overnight lows around 9.0°C. Compared to the annual average high of 13.6°C, August runs +11.1°C.
August in Boulder averages a daytime high of 24.8°C and an overnight low of 9.0°C.
August runs +11.1°C compared to Boulder's annual average high of 13.6°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 24.8°C and cooler evenings around 9.0°C.