Rockville Weather in July

The climate in Rockville during July can be summarized as hot, humid and wet.

July is in the summer in Rockville and is typically the warmest month of the year. Daytime maximum temperatures average around a muggy 31°C (87°F), whilst at night 18°C (64°F) is normal.

On average July is the wettest month of the year in Rockville with around 121mm 4.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 10.7 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Rockville in July 2025.