In April, Boulder typically sees daytime highs of 11.5°C and overnight lows around -2.8°C. Compared to the annual average high of 13.6°C, April runs -2.1°C.
April in Boulder averages a daytime high of 11.5°C and an overnight low of -2.8°C.
April runs -2.1°C compared to Boulder's annual average high of 13.6°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 11.5°C and cooler evenings around -2.8°C.