May Weather in Rockville, United States

Last updated: June 24, 2025

In Rockville, United States, the average temperature in May hovers around 14°C (58°F). Temperatures can vary widely, dipping as low as -1°C (31°F) or soaring to 36°C (96°F). This month typically sees 95 mm (3.7 in) of precipitation spread over 11 days, with an average humidity level of 78%.

May Temperature in Rockville

In May in Rockville, the average temperature is 14°C (58°F), with maximums reaching up to 36°C (96°F) and minimums dropping as low as -1°C (31°F). It's a diverse climate, so make sure to pack for both warm and cool conditions while traveling!

May Weather in Rockville: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Rockville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rockville, May typically has an average temperature of 14°C (58°F), with highs reaching up to 36°C (96°F) and lows dropping to around -1°C (31°F).

Data source: Temperature data for Rockville generated using information from the Copernicus Climate Change Service.

May Precipitation in Rockville

In Rockville in May, the total precipitation amount is 95 mm (3.7 in) spread over 11 days.

May Precipitation Trends in Rockville

The chart displays monthly precipitation patterns in Rockville, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Rockville, May typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Rockville

In Rockville in May, humidity is 78%. With an average temperature of 14°C (58°F), this humidity feels like a damp embrace, making traveling a bit uncomfortable as the air clings to your skin, causing you to sweat more than usual while exploring.

May Average Humidity in Rockville

This chart illustrates the average monthly humidity levels in Rockville, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Rockville is approximately 78%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Rockville

In Rockville in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Rockville.

Maximum UV Index Levels in Rockville for May

The chart shows the monthly maximum UV Index (UVI) for Rockville in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Rockville typically reaches 9, which falls under the very high exposure category.

Data source: Rockville May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How May Weather in Rockville Compares to Other Months

Weather in Rockville varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Rockville, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Rockville, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	19 mm (0.8 inches)	87%	low
February Weather	-10°C (15°F)	24 mm (1.0 inches)	90%	moderate
March Weather	0°C (31°F)	50 mm (2.0 inches)	85%	moderate
April Weather	5°C (42°F)	81 mm (3.2 inches)	84%	high
May Weather	14°C (58°F)	95 mm (3.7 inches)	78%	very high
June Weather	21°C (71°F)	69 mm (2.7 inches)	80%	very high
July Weather	23°C (74°F)	98 mm (3.9 inches)	81%	very high
August Weather	21°C (70°F)	143 mm (5.6 inches)	81%	very high
September Weather	17°C (63°F)	115 mm (4.5 inches)	81%	high
October Weather	8°C (47°F)	103 mm (4.1 inches)	84%	moderate
November Weather	0°C (32°F)	29 mm (1.2 inches)	88%	moderate
December Weather	-6°C (22°F)	45 mm (1.8 inches)	84%	low