Belgium Heatwave Crisis: Highest Excess Mortality in Europe

Belgium recorded the highest excess mortality rate in Europe during the exceptional heatwave that struck the country in late June 2026, according to data from the European mortality monitoring network EuroMOMO. The findings, reported by RTBF, reveal that Belgium experienced approximately 2,000 excess deaths during the 10-day heatwave—a staggering 48% above the baseline mortality rate—prompting urgent questions about the nation’s preparedness for increasingly frequent extreme heat events driven by climate change.

A Perfect Storm of Heat and Pollution

The heatwave, which began on June 18 and continued through early July, was exceptional in both duration and intensity. Temperatures exceeded 28°C for ten consecutive days, peaking at 35.5°C on June 26. Two tropical nights on June 25-26 saw minimum temperatures near 24°C, providing no respite for vulnerable populations. The deadliest day was June 27, recording 641 deaths—146.5% above normal—marking it as the second deadliest day of the 21st century in Belgium.

According to Sciensano, Belgium’s public health institute, the combination of prolonged extreme heat, high ozone concentrations, and elevated particulate matter levels created a deadly environmental cocktail. Western Europe experienced its hottest June on record in 2026, with an average temperature of 20.74°C, according to the Copernicus Climate Observatory. Climate scientists warn that extreme heat events will become more frequent and intense due to climate change.

Stark Regional Disparities

The heatwave’s impact was far from uniform. Wallonia, the poorer southern region, suffered a 77% excess mortality rate compared to 31% in Flanders—a disparity that underscores the deep socio-economic dimension of climate vulnerability.

Lara Kotlar, spokesperson for AVIQ, the Walloon agency for quality of life, told RTBF: “How can this be explained? Precariousness, the health of Walloons is less good, and there were also isolated people. In nursing homes, there was very rapid monitoring on site by our services. But it’s clear that in France, there was a more solid, more established plan than here because we have never experienced such a situation.”

Institutional Fragmentation and Political Fallout

Belgium’s complex federal structure—requiring coordination among three regional governments in Flanders, Wallonia, and Brussels-Capital—has been identified as a structural vulnerability in responding to climate emergencies. Unlike France, which implemented a robust centralized heatwave alert system after the deadly 2003 heatwave that caused 15,000 excess deaths in 15 days, Belgium lacked a comparable unified approach.

The political response has been fractious. Jean-Luc Crucke of the Les Engagés party called for a national roundtable on climate crisis coordination—a request that went unanswered and reportedly strained relations within the Council of Ministers. Walloon Minister Yves Coppieters described the excess mortality figures as “preoccupying.”

Prime Minister Bart De Wever defended the government’s response, stating that municipalities and provinces functioned well during the crisis, while adding that “citizens must also take responsibility for their own safety.” He acknowledged that “it wasn’t perfect, but we have learned and we will evolve.”

Lessons Applied as New Heatwave Looms

In the wake of the crisis, authorities have implemented several measures. AVIQ reports that updated recommendations have been sent to coordinating physicians in retirement homes, ensuring adequate medical coverage during the holiday period. A dedicated call-center has been established in Luxembourg province to check on isolated and elderly individuals. The Walloon high heat and ozone alert phase has been activated for the third time this summer.

These preparations come none too soon. Meteorologists forecast a new heatwave approaching Belgium, with temperatures expected to reach 33°C and remain near 30°C for approximately 10 days. However, officials express cautious optimism that cooler nighttime temperatures in the forecast will provide critical relief.

“The announced heatwave is certainly hot, but it will be more relative because the nights will be cool and that changes everything,” Kotlar said. “Houses will be able to cool down and bodies too during the night. We are more prepared this time because all stakeholders have remained vigilant and mobilized.”

The Road Ahead

The June 2026 heatwave has exposed critical vulnerabilities in Belgium’s approach to extreme weather events. The stark socio-economic divide in mortality rates, the challenges of coordinating across three regional governments, and the absence of a centralized heatwave plan comparable to France’s system all demand urgent policy attention.

As climate scientists warn that extreme heat events will become more frequent and intense, the central question remains: can Belgium develop resilience fast enough? The answer will determine whether the tragic toll of 2,000 excess deaths serves as a catalyst for meaningful reform or a harbinger of crises yet to come.