"Spring 2020 is also the sunniest on record for the UK, exceeding the sunshine amount for most summer seasons," the agency tweeted.
The previous record was 265 hours of sunshine, set in June 1957. Records go back to 1929.
“The most remarkable aspect is just how much some of the May and Spring records for these climate statistics have been exceeded. Exceeding the UK sunshine record is one thing, but exceeding by over 70 hours is truly exceptional," Mark McCarthy, head of the Met Office’s National Climate Information Center, said in a statement.
"The sunshine figures for spring would even be extremely unusual for summer and only three summers would beat Spring 2020 for sunshine hours," McCarthy added.
Forecasters said that May 2020 was also the driest May in England on record, and the second driest in Wales, in a rainfall series that goes even further back, to 1862.
Overall, it has been the sunniest spring on record for the U.K. and the fifth driest, which came after the country had experienced its fifth wettest winter.
McCarthy said that an extended area of high pressure centered over or close to the U.K. suppressed clouds and rainfall, allowing "plenty of sunshine to reach the surface."
"There has been a band of similar weather conditions extending across central parts of Europe, whereas Iberia and parts of Scandinavia have experienced rather wetter conditions," he said.
The warm and dry weather has raised concerns over whether it may make a potential second spike in the country’s coronavirus outbreak more likely, especially now that all four U.K. nations — England, Scotland, Wales and Northern Ireland — have started easing some of the lockdown restrictions, albeit at different speeds.
Over the weekend, beaches and parks were packed with many people clearly not observing social distancing guidelines to stay six feet apart.
Chaotic scenes at beaches on the Jurassic Coast in southern England, which saw three people seriously injured after jumping off cliffs into the sea, prompted a local leader to call for stricter travel rules.
Vikki Slade, the leader of Bournemouth, Christchurch and Poole Council, has written to lawmakers and Dorset Police after the weekend incidents, including at the limestone arch of Durdle Door.
She said she had witnessed incidents of people failing to adhere to social distancing rules, parking illegally, widespread barbecues, and staff facing abuse while working.
“We saw the most awful scenes in Durdle Door with the arrival of two helicopters to deal with the stupidity of people jumping from the top of cliffs, cheered and clapped by thousands of beachgoers,” she said.
The Associated Press contributed to this report.