In June, Rockville typically sees daytime highs of 28.3°C and overnight lows around 15.3°C. Compared to the annual average high of 18.5°C, June runs +9.8°C.
June in Rockville averages a daytime high of 28.3°C and an overnight low of 15.3°C.
June runs +9.8°C compared to Rockville's annual average high of 18.5°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 28.3°C and cooler evenings around 15.3°C.