Output from NASA’s GEOS (Goddard Earth Observing
System) global model shows daily maximum surface air temperature across Western
Europe from May 1 to August 19, 2026. The darkest red areas indicate
temperatures that met or exceeded 40°C (104°F).
NASA Earth Observatory/Lauren Dauphin
Western
Europe got its first hint of an unusual summer in May 2026, when a heat dome
produced exceptional temperatures that shattered records in several countries. Remarkable as it was,
that early heat wave turned out to be only the opening salvo.
By mid-August, Europeans were sweating
through their fifth heat wave of the season, with the latest onslaught pushing temperatures well
above 40 degrees Celsius (104 degrees Fahrenheit) across a broad area. During
these bouts of extreme weather, high temperatures were often unrelenting,
persisting for several days and sometimes weeks on end, and remaining
overnight.
For a region accustomed to relatively
mild summers, the heat upended everyday life. Hospitalizations and heat-related
deaths spiked. Highways and train tracks buckled, forcing road closures and service disruptions. Large and destructive wildfires raged in
areas where they were once rarely seen. The heat also worsened the severe drought that has gripped the region for months, contributing to record-low river water levels and disrupting water and power supplies,
transportation routes, and agriculture.
The animation above shows the daily
maximum surface air temperature across Western Europe from May 1 to August 19,
2026. It was produced by combining satellite observations with temperatures
predicted by a version of NASA’s GEOS (Goddard
Earth Observing System) global model, which uses mathematical equations to
represent physical processes in the atmosphere. The darkest red areas indicate
where temperatures met or exceeded 40°C.
The heat broke records at a furious pace, often by wide margins. According to
the UK Met Office, temperatures soared as high as 35.1°C (95.2°F) in London on May 26,
smashing the previous May record by 2.3°C (4.1°F). In June, Bordeaux, France,
broke its maximum-temperature record on three consecutive days, hitting 42.5°C
on June 24, Météo-France reported. Slovakia,
meanwhile, set new national records for both daytime and nighttime highs in August. Combined June and July temperatures in Western Europe
were the highest on record, according to Europe's Copernicus climate monitoring service.
In Europe, extreme temperatures collided
with several vulnerabilities, including limited access to air conditioning, high nighttime temperatures, and a lack of green space in some cities.
The circumstances triggered not just discomfort but heat exhaustion and heatstroke in some cases. Preliminary reports suggest that heat may have been
associated with 10,000 excess deaths, including thousands of people in the UK, France, Germany, and Belgium.
"Air conditioning is an especially
critical issue in Europe in the short term," said Anamika Shreevastava, a
researcher at New York University who studied urban heat islands as a postdoc at NASA’s Jet Propulsion Laboratory. One of her goals
was to produce thermal maps based on NASA data from missions like ECOSTRESS that city planners could use to make cities more resilient to heat
waves.
International Energy Agency data show that 23 percent of homes in Europe have air conditioning,
compared to 90 percent of homes in the United States. That difference
contributes to the much higher death rates that researchers have documented in European
cities during heat waves than in comparable American cities. "Longer term,
cities can also plant trees, expand parks, use reflective roof paint, and
transition to building materials less likely to retain heat,” Shreevastava
said.
An analysis from the World Health Organization indicates that heat stress is the world’s leading cause of
weather-related deaths, noting it exacerbates underlying illnesses, including
cardiovascular disease, diabetes, mental health conditions, and asthma.
Researchers have calculated that roughly 489,000 heat-related deaths occur each
year, with 45 percent of the deaths in Asia and 36 percent in Europe.
"For older adults with physical
health problems, temperatures as low as 26.7°C (80°F) can pose significant
danger," said Deborah Carr, a Boston University sociologist who
specializes in the study of aging. "Nighttime heat is especially
harmful for older adults whose homes lack air conditioning."
Carr is part of a research team that
used demographic data, along with temperature and climate data archived by NASA, to identify which parts of the world are at the greatest risk of current and
future heat exposure. Southern Europe was among the areas facing growing heat
exposure and an aging population, the researchers found.
Other research, published in Lancet Planetary Health in August 2026, underscores the importance of demographics in
assessing the risks posed by heat. This study, led by Stanford researcher
Qinqin Kong, mapped where increasing heat is likely to lead to intolerable
conditions in the coming decades for young, middle-aged, and older adults,
concluding that safe thresholds will be breached often and widely, with risks
falling disproportionately on older people.
"The human body can tolerate only a
limited range of ambient heat," said Kong, a recipient of a NASA Earth and Space Science and
Technology award. “Understanding where, when, and to
what extent these limits are exceeded is critical.”
With intolerable levels of heat expected
to affect more people across larger regions and for longer periods than
previously thought, Kong and his colleagues hope that their findings will
inform targeted heat action plans, emergency preparedness, and health system
planning.
NASA Earth Observatory image by Lauren Dauphin, using GEOS-FP data from the Global Modeling and Assimilation Office at NASA GSFC. Story by Adam Voiland.
