In August, Rockville typically sees daytime highs of 29.8°C and overnight lows around 17.3°C. Compared to the annual average high of 18.5°C, August runs +11.2°C.
August in Rockville averages a daytime high of 29.8°C and an overnight low of 17.3°C.
August runs +11.2°C compared to Rockville's annual average high of 18.5°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 29.8°C and cooler evenings around 17.3°C.