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May Weather in Rockville, United States

Last updated: June 24, 2025

In May, the average temperature in Rockville, United States hovers around 15°C (60°F), with minimums dropping to 1°C (34°F) and maximums soaring up to 34°C (94°F). Expect about 113 mm (4.5 in) of precipitation spread over 13 days, accompanied by a comfortable average humidity of 69%.

May Temperature in Rockville

In May in Rockville, the average temperature is 15°C (60°F). The maximum can reach 34°C (94°F), while the minimum can be as low as 1°C (34°F). It's advisable to pack layers to accommodate the varied temperatures during your travels.

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 15°C (60°F), with highs reaching up to 34°C (94°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec303339495969757366564234
Data source: Temperature data for Rockville generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Rockville

In Rockville in May, the precipitation amount is 113 mm (4.5 in) accumulated over 13 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 113 mm (4.5 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec66868912511385145909813291123
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Rockville

In Rockville in May, humidity is 69%. With an average temperature of 15°C (60°F), this humidity feels like a cool, damp embrace that can make outdoor activities feel slightly heavier and more exhausting, but still inviting for exploring the charming sights and sounds of the area.

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 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
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.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)66 mm (2.6 inches)84%moderate
February Weather1°C (33°F)86 mm (3.4 inches)82%moderate
March Weather4°C (39°F)89 mm (3.5 inches)81%high
April Weather9°C (49°F)125 mm (4.9 inches)78%very high
May Weather15°C (60°F)113 mm (4.5 inches)69%very high
June Weather20°C (69°F)85 mm (3.4 inches)69%very high
July Weather24°C (75°F)144 mm (5.7 inches)62%very high
August Weather23°C (74°F)90 mm (3.5 inches)65%very high
September Weather19°C (67°F)98 mm (3.8 inches)68%very high
October Weather13°C (56°F)132 mm (5.2 inches)74%high
November Weather6°C (43°F)91 mm (3.6 inches)82%moderate
December Weather1°C (34°F)123 mm (4.9 inches)80%low

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