May Weather in London, United States

Last updated: June 24, 2025

In London, United States, the average temperature in May hovers around 17°C (64°F). Be prepared for a range of weather, as temperatures can dip to a chilly -1°C (31°F) or soar up to a warm 32°C (90°F). Precipitation is fairly common, with about 131 mm (5.1 in) of rain falling over 15 days, accompanied by an average humidity of 81%. So, whether you're packing for warmth or a light drizzle, it's good to be prepared!

May Temperature in London

In May in London, the average temperature is 17°C (64°F). The maximum can reach 32°C (90°F), while the minimum can drop as low as -1°C (31°F). Be prepared for both warm days and chilly nights during your travels!

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

The chart illustrates May temperature patterns in London, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In London, May typically has an average temperature of 17°C (64°F), with highs reaching up to 32°C (90°F) and lows dropping to around -1°C (31°F).

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

May Precipitation in London

In London in May, the precipitation amount is 131 mm (5.1 in) over a span of 15 days.

May Precipitation Trends in London

The chart displays monthly precipitation patterns in London, 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 London, May typically receives around 131 mm (5.1 inches) of precipitation spread over approximately 15 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 London

In London in May, humidity is 81%. With an average temperature of 17°C (64°F), this humidity feels like walking through a warm mist, enveloping you in a sticky embrace that can quickly lead to discomfort during long sightseeing excursions.

May Average Humidity in London

This chart illustrates the average monthly humidity levels in London, 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 London is approximately 81%, 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 London

In London in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in London.

Maximum UV Index Levels in London for May

The chart shows the monthly maximum UV Index (UVI) for London 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 London typically reaches 10, which falls under the very high exposure category.

Data source: London 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 London Compares to Other Months

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

This table compares monthly weather conditions in London, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	75 mm (3.0 inches)	88%	moderate
February Weather	1°C (34°F)	104 mm (4.1 inches)	88%	moderate
March Weather	6°C (42°F)	108 mm (4.2 inches)	87%	high
April Weather	11°C (52°F)	111 mm (4.4 inches)	85%	very high
May Weather	17°C (64°F)	131 mm (5.1 inches)	81%	very high
June Weather	22°C (72°F)	134 mm (5.3 inches)	82%	very high
July Weather	24°C (75°F)	120 mm (4.7 inches)	81%	very high
August Weather	23°C (73°F)	99 mm (3.9 inches)	73%	very high
September Weather	20°C (69°F)	94 mm (3.7 inches)	73%	very high
October Weather	14°C (58°F)	95 mm (3.7 inches)	78%	high
November Weather	5°C (42°F)	95 mm (3.7 inches)	89%	moderate
December Weather	2°C (36°F)	95 mm (3.8 inches)	87%	moderate