Rockville (MD) Weather & Climate: Best Time to Visit

The climate in Rockville is known for significant temperature differences throughout the year, making the weather dynamic. Average maximum daytime temperatures range from a very warm 31°C (88°F) in July, the warmest time of the year, to a chilly 5°C (41°F) during cooler months like January.

At night, you can expect temperatures ranging from 20°C (68°F) in July to around -4°C (25°F) during January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Rockville has a notably wet climate with abundant precipitation, recording 1161 mm (46 in) of rain/snowfall per year. While rainfall varies throughout the year, each season offers its own charm. October brings wetter days averaging 133 mm (5.2 in) of precipitation, spread over 10 rainy days.

In contrast, the driest month February experiences a drier climate, with about 67 mm (2.6 in) of rainfall spread across 10 rainy days. For more details, please visit our Rockville Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Rockville. While June receives considerable daily sunshine with up to 9.4 hours, December marks the darkest time of the year, where sunshine is scarce with only 4.3 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Rockville.

The city experiences its highest humidity in August, reaching 69%. In March, the humidity drops to its lowest level at 58%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year