Europe’s June heatwave killed thousands

What's happened

Public Health France has reported 5,764 excess deaths between 17 June and 2 July, the highest heatwave excess mortality since 2003. Researchers in the UK have estimated about 2,700 heat-related deaths in England and Wales across May and June, and EuroMOMO and national agencies have reported over 10,000 excess deaths across western Europe in late June, mostly among those over 65.

What's behind the headline?

What the figures mean

• Public Health France has recorded 5,764 excess deaths across 17 June–2 July, a 36% rise above expected deaths; more than half occurred between 25 and 27 June. This is the largest heatwave excess mortality in France since 2003.
• UK researchers at Imperial College, the Met Office and LSHTM have modelled roughly 2,700 heat-related deaths in England and Wales across two heatwaves in May and June and attribute roughly 40–60% of those deaths to human-caused warming.
• EuroMOMO has reported a spike of more than 10,000 excess deaths across western Europe in the week ending 28 June, concentrated among people aged 65 and older.

Why these estimates vary

• Different methods: France and national agencies report excess all-cause mortality versus modelled "heat-related" deaths that use temperature–mortality relationships. EuroMOMO aggregates weekly excess across many countries. These approaches measure related but not identical phenomena.
• Timing and attribution: excess-death tallies record observed departures from expected deaths; attribution studies estimate how much hotter temperatures were because of greenhouse gases and how many deaths that added. Expect national totals and attribution fractions to differ.

Consequences and next steps

• Health systems will remain under pressure: hospitals and ambulance services have declared critical incidents and care homes have reported spikes in admissions. Authorities are extending heat warnings and restricting outdoor work at midday where temperatures remain extreme.
• Policy response will shift toward adaptation as well as mitigation: governments will face more demands to harden infrastructure, upgrade cooling in health and care settings and set workplace temperature rules.
• Mortality patterns will shift: if temperatures keep rising, heat-related deaths will concentrate in older age groups and among socioeconomically vulnerable people who lack cooling or safe housing.

What to watch next

• National mortality offices and UKHSA will publish finalized death tallies and interim analyses that will refine estimates.
• World Weather Attribution and similar teams will publish peer-reviewed attribution results clarifying how much human-driven warming increased peak temperatures.
• Policy moves on workplace temperature limits, cooling in hospitals and national heat plans will indicate whether governments are treating heat as a systemic health threat.

How we got here

Record temperatures in late June pushed daytime peaks above 40C in parts of France and Spain and to 37.7C in England. Health agencies and research teams have used excess-mortality modelling and climate attribution to compare observed deaths with expected baselines and to estimate how much human-caused warming raised temperatures and the death toll.

Our analysis

Public Health France has said the regions affected between 17 June and 2 July "recorded 21,674 deaths from all causes" and, using historical baselines, that "the difference... a total of 5,764... are therefore considered to be 'excess' deaths" (Independent/AP reporting from the agency). France 24 and The Guardian both reported that two-thirds of the excess deaths were among people aged 75 and older and that "half passed away in just three days from June 25 to 27". UK-focused studies from Imperial College, the Met Office and the London School of Hygiene and Tropical Medicine have provided modelled estimates for England and Wales: the teams have said there were about 550 heat-related deaths in May and nearly 2,200 in June, and they have estimated that roughly 40–60% of those deaths "died as a result of the extra heat caused by human-induced warming" (The New Arab, Independent, Al Jazeera, BBC). The Independent and BBC quoted Dr Clair Barnes and UKHSA figures and methods, explaining that researchers used historical temperature–mortality relationships across small regions to estimate heat-related excess deaths and then compared those to counterfactuals without human-caused warming. EuroMOMO and multiple outlets (Independent, Al Jazeera) reported a concentrate of excess deaths in the week ending 28 June: EuroMOMO estimated 14,260 excess deaths across participating countries that week, with more than 12,000 among people aged 65 and older, and concluded the spike is most plausibly linked to the heatwave (Independent). Coverage differs in emphasis: French outlets and Public Health France present observed excess all-cause deaths with age breakdowns and regional detail; UK coverage highlights modelled attribution to climate change and methods used to separate heat-driven deaths from expected baselines; pan-European outlets emphasise the scale of weekly excess across countries and the burden on older people. Readers should consult Public Health France for the national excess-death breakdown, the Imperial/Met/LSHTM

Go deeper

• How will national mortality figures change when final death registrations are published?
• Which government agencies are planning new rules for workplace temperatures and cooling in care homes?
• How will attribution studies translate into policy demands for adaptation versus emissions cuts?

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