May Weather in London, United States

Last updated: June 24, 2025

In London, United States, the average temperature in May hovers around 20°C (67°F), making it a pleasant time to explore. However, be prepared for a wide range as temperatures can dip to a chilly 0°C (32°F) or soar to a sizzling 34°C (94°F). With an average precipitation of 126 mm (5.0 in) spread over 15 days, and an average humidity of 84%, it's wise to pack an umbrella along with your sunblock for this dynamic month!

May Temperature in London

In May in London, the average temperature is 20°C (67°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop as low as 0°C (32°F). It's essential to pack accordingly for both warm days and cool nights while traveling during this time.

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 20°C (67°F), with highs reaching up to 34°C (94°F) and lows dropping to around 0°C (32°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 126 mm (5.0 in) spread over 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 126 mm (5.0 inches) of precipitation spread over approximately 15 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 London

In London in May humidity is 84%. With an average temperature of 20°C (67°F), this humidity feels like walking through a warm, thick blanket that wraps around you, making travel feel heavy and sticky while also creating a sensation of warmth that can lead to exhaustion if you're not careful.

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 84%, 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 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 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 11, which falls under the extreme 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	3°C (38°F)	98 mm (3.9 inches)	88%	moderate
February Weather	6°C (43°F)	179 mm (7.0 inches)	88%	high
March Weather	10°C (49°F)	134 mm (5.3 inches)	87%	high
April Weather	14°C (57°F)	134 mm (5.3 inches)	84%	very high
May Weather	20°C (67°F)	126 mm (5.0 inches)	84%	extreme
June Weather	23°C (73°F)	141 mm (5.5 inches)	83%	extreme
July Weather	25°C (78°F)	109 mm (4.3 inches)	79%	extreme
August Weather	24°C (76°F)	123 mm (4.8 inches)	66%	very high
September Weather	22°C (72°F)	107 mm (4.2 inches)	67%	very high
October Weather	16°C (61°F)	120 mm (4.7 inches)	76%	high
November Weather	8°C (46°F)	76 mm (3.0 inches)	89%	moderate
December Weather	6°C (43°F)	135 mm (5.3 inches)	88%	moderate