May Weather in McLean, United States

Last updated: June 24, 2025

In McLean, United States during May, the average temperature is a pleasant 20°C (68°F), with a minimum dipping to 2°C (36°F) and soaring to a maximum of 37°C (99°F). Expect 82 mm (3.2 in) of precipitation spread over 11 days, contributing to an average humidity of 78%. Pack accordingly for a delightful mix of sun and showers!

May Temperature in McLean

In May in McLean, the average temperature is 20°C (68°F). Maximum can reach 37°C (99°F) and minimum can be as low as 2°C (36°F). This makes it essential for travelers to pack layers and be prepared for both warm and cool conditions.

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

The chart illustrates May temperature patterns in McLean, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In McLean, May typically has an average temperature of 20°C (68°F), with highs reaching up to 37°C (99°F) and lows dropping to around 2°C (36°F).

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

May Precipitation in McLean

In McLean in May, the precipitation amount is 82 mm (3.2 in) over the course of 11 days.

May Precipitation Trends in McLean

The chart displays monthly precipitation patterns in McLean, 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 McLean, May typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

May Humidity in McLean

In McLean in May humidity is 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

May Average Humidity in McLean

This chart illustrates the average monthly humidity levels in McLean, 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 McLean 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 McLean

In McLean in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in McLean.

Maximum UV Index Levels in McLean for May

The chart shows the monthly maximum UV Index (UVI) for McLean 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 McLean typically reaches 11, which falls under the extreme exposure category.

Data source: McLean 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 McLean Compares to Other Months

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

This table compares monthly weather conditions in McLean, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	23 mm (0.9 inches)	75%	moderate
February Weather	4°C (39°F)	15 mm (0.6 inches)	76%	high
March Weather	11°C (51°F)	59 mm (2.3 inches)	64%	very high
April Weather	14°C (58°F)	36 mm (1.4 inches)	70%	very high
May Weather	20°C (68°F)	82 mm (3.2 inches)	78%	extreme
June Weather	25°C (77°F)	59 mm (2.3 inches)	81%	extreme
July Weather	27°C (81°F)	36 mm (1.4 inches)	82%	extreme
August Weather	26°C (79°F)	43 mm (1.7 inches)	78%	extreme
September Weather	23°C (73°F)	50 mm (2.0 inches)	72%	very high
October Weather	15°C (59°F)	69 mm (2.7 inches)	73%	high
November Weather	9°C (49°F)	14 mm (0.5 inches)	80%	moderate
December Weather	6°C (42°F)	23 mm (0.9 inches)	81%	moderate