Belgium recorded nearly three thousand excess deaths during this summer’s run of heatwaves, health authorities confirmed this week, just days after the national weather agency declared the season the hottest on record for the country. The figures from public health institute Sciensano show the toll represents the worst heat related mortality since the institute began tracking such data in the year 2000.
According to the report, heatwaves stretching from June 18 through August 16 caused two thousand nine hundred thirty five excess deaths nationwide, representing a twenty two point six percent increase in mortality above normal expected levels for the period. The figures place Belgium among the hardest hit nations in Europe this summer relative to its population size, as extreme heat swept across the continent for months on end.
The most severe stretch came early in the summer, between June 18 and July 3, when Belgium recorded its highest excess mortality on record for any tracked heatwave period. During those sixteen days, two thousand thirty five more people died than would normally be expected, an increase of nearly forty nine percent above typical levels. Temperatures during that period reached around thirty degrees Celsius for ten consecutive days, including three days above thirty five degrees, with unusually warm nighttime temperatures compounding the strain on vulnerable residents.
The single deadliest day came on June 27, when six hundred forty one people died across the country due to extreme heat, according to figures released by health officials. During periods of intense heat, the human body can suffer heat stroke, when its temperature regulation system fails entirely and core body temperature climbs to dangerous levels, causing organs to malfunction. Extreme heat can also trigger cardiovascular collapse, as the body redirects blood toward the skin in an effort to cool itself, placing severe strain on the heart in the process.
Two additional heatwave periods followed later in the summer, though with somewhat lower mortality impact. The stretch from July 4 to 17 saw five hundred thirty five excess deaths, an increase of nearly fifteen percent, while the period from July 28 to August 16 recorded three hundred sixty five excess deaths, a smaller uptick of seven percent. That third heatwave also coincided with the beginning of the worst wildfire in the country’s modern history, adding further strain to emergency services already stretched thin by the extreme conditions.
Belgium’s national weather agency confirmed earlier in the week that summer 2026 ranked as the hottest ever recorded in the country, with the average temperature at the official reference station in Uccle, just outside Brussels, reaching twenty point three degrees Celsius, some two point four degrees above the average of recent decades. That milestone places Belgium among a growing list of European nations that have shattered temperature records this year as the continent continues experiencing increasingly extreme summer conditions.
Belgium’s toll, while severe, remained lower in absolute terms than several larger neighboring countries. Germany recorded roughly fourteen thousand heat related deaths by the end of August, while France and Spain each reported thousands of excess deaths tied to their own extreme summer conditions. Scientists studying the trend say climate change is making such extreme heat events more frequent and more intense, resulting in temperature records falling with greater regularity across the continent.
With this summer’s toll now confirmed, pressure is mounting on Belgian politicians to develop a more comprehensive national heat response plan capable of better protecting vulnerable residents during future extreme weather events. As climate scientists warn that summers of this intensity may become increasingly common rather than exceptional, the coming months are likely to see renewed debate over what concrete steps the country should take to reduce heat related mortality in the years ahead.
