In August, Flagstaff typically sees daytime highs of 26.5°C and overnight lows around 10.2°C. Compared to the annual average high of 16.9°C, August runs +9.7°C.
August in Flagstaff averages a daytime high of 26.5°C and an overnight low of 10.2°C.
August runs +9.7°C compared to Flagstaff's annual average high of 16.9°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 26.5°C and cooler evenings around 10.2°C.