May weather forecast and climate
London, United Kingdom

The large Thames river in London overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom, on a cloudy evening after sunset
The large Thames river in London overlooking the Westminster Palace and the Big Ben clock tower in London, United Kingdom, on a cloudy evening after sunset
May is the beginning of the best weather conditions in London as the average temperatures warm up to register in the 8.3°C (46.9°F) to 17.8°C (64°F) range.
The long 16-hour days bring cheer to the vacation crowds as the sun meets them for a daily 6.4 hours. The blooming buds of early spring turn into blossoming flowers and spread a fragrant aroma in the atmosphere, especially in the suburban landscape. May is the wettest month of the spring season and registers 48.3mm (1.9") of rain.
The weather is perfect for exploring the Thames River through the endless available options of cruises, boats, and tours.

What is the temperature in May in London?

The average high-temperature, in May, in London, United Kingdom, is 17.9°C (64.2°F), while the average low-temperature is 8.7°C (47.7°F).
Average temperature in May - London, United Kingdom
  • Average high temperature in May: 17.9°C

The warmest month (with the highest average high temperature) is July (23.5°C).
The month with the lowest average high temperature is January (8.1°C).

  • Average low temperature in May: 8.7°C

The month with the highest average low temperature is July (13.9°C).
The coldest month (with the lowest average low temperature) is February (2.1°C).

Average rainfall in May - London, United Kingdom
  • Average rainfall in May: 49.4mm

The wettest month (with the highest rainfall) is October (68.5mm).
The driest month (with the lowest rainfall) is February (40.9mm).

Average rainfall days in May - London, United Kingdom
  • Average rainfall days in May: 8.8 days

The month with the highest number of rainy days is January (11.1 days).
The month with the lowest number of rainy days is August (7.5 days).

Average daylight in May / Average sunshine in May - London, United Kingdom
  • Average daylight in May: 15.6h

The month with the longest days is June (Average daylight: 16.5h).
The month with shortest days is December (Average daylight: 7.9h).

  • Average sunshine in May: 6.4h

Months with most sunshine are June and July (Average sunshine: 6.8h).
The month with least sunshine is December (Average sunshine: 1.7h).

Average UV index in May - London, United Kingdom
  • Average UV index in May: 5

Months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 0).

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