July 13 (UPI) — Exceptionally hot weather in May and June was responsible for the heat-related deaths of at least 2,700 people in England and Wales, according to British research out Monday that found that human-caused climate change was a significant factor.

Temperature records for both months fell during heat waves May 21-29 and June 18-28, with the bulk of the fatalities — 2,200 — in June when the temperature rose to as high as 99.9 degrees Fahrenheit compared with average daytime highs of 68 degrees Fahrenheit, the Met Office said in a news release.

Researchers from Imperial College London, the London School of Hygiene & Tropical Medicine and the Met Office modeled excess deaths — those over and above normal levels — during both heat waves using historical mortality records and established peer-reviewed methods.

Notably, almost 6 in 10 of fatalities during the May heat wave were attributed to additional heat contributed by human-caused climate change, compared with a little less than 4 in 10 during the heat wave in June, which was hotter and lasted longer.

The scientists said daytime maximum temperatures approximately 7 degrees Fahrenheit higher than they would have been without human-induced climate change had fueled temperatures that would have otherwise been far less likely to occur — making the heat waves far more hazardous to human health.

“We all love the sun, but people need to be aware that we are now seeing dangerous climate-change-fueled heat that is claiming lives, disrupting schools and hospitals and shutting down transport and infrastructure,” said Dr. Clair Barnes, Research Associate in Extreme Weather and Climate Change at Imperial College London.

“It’s time we woke up to the fact that we now live in a country with dangerously hot summers. To protect people during future extremes, we must urgently adapt to the reality of the climate we now have, and double down on global efforts to reach net zero emissions to stop this from getting worse,” she said.

Dr. Malcolm Mistry, Assistant Professor in Climate and Geo-spatial Modelling at the London School of Hygiene & Tropical Medicine, expressed concern that only a few weeks into summer England and Wales had already experienced two record-breaking heat waves.

He warned that with spikes of extreme hot weather more frequent and more intense due to human activity, summer heat waves were “rapidly evolving into a major health risk for people in the United Kingdom.”

Mistry said it was critical that changes to homes, workplaces and critical infrastructure to cope with extreme heat kept ahead of rising health risks in order to protect the elderly, children, babies and other vulnerable groups.

The Met Office said 2026 has been exceptional with the two heat waves topping records that had stood since May 1944 and June 1976.

“For the time of year these events were extreme, even in our warmer climate,” said Climate Attribution Manager, Dr. Mark McCarthy.

The climate division of the U.K. Health Security Agency said that with periods of heat likely to become more intense, longer and more frequent as the world continued to warm, the study showed the “scale of risk associated with extreme heat and the growing threat climate change poses to our wellbeing.”

Continental Europe has also been in the grip of a more or less continuous heat wave since May that has placed health systems under huge pressure, triggered deadly wildfires that have burned through tens of thousands of hectares of woodland and scrubland, crippled power grids and forced schools to close.

The World Health Organization said Sunday that 1,300 excess deaths reported across Europe since June 21 were linked to the high temperatures.

Director-General Tedros Adhanom Ghebreyesus said Europe was warming twice as fast as the rest of the world with 150 million people suffering the negative impacts of the extreme heat.

France’s Health Ministry said Sunday that there were 1,000 extra deaths between Wednesday and Saturday alone, compared with previous months.