World Experiences Third-Hottest August in History, 2025 Data Shows

August 2025 Marks World’s Third-Hottest Month, Heatwaves and Wildfires Intensify Climate Concerns

August 2025 was the third-hottest August on record globally, with searing heatwaves and devastating wildfires highlighting the urgent need to tackle climate change, the EU’s Copernicus Climate Change Service reported Tuesday.

Southwest Europe suffered a third consecutive summer heatwave, with Spain and Portugal battling intense fires that forced thousands to evacuate. Spain recorded a 16-day heatwave that claimed over 1,100 lives, according to the Carlos III Health Institute. Meanwhile, much of Asia experienced above-average temperatures, including record-breaking summers in the UK, Japan, and South Korea.

The world’s oceans, which absorb excess heat, also remained near record highs. Hotter seas are linked to worsening storms, floods, and other extreme weather events. “These conditions underline not only the urgency of reducing emissions but also the critical need to adapt to more frequent and intense climate extremes,” said Samantha Burgess, strategic lead for climate at Copernicus.

Global average temperatures in August were 1.29°C above pre-industrial levels, just below the record set in 2023 and matching 2024. While incremental, such rises are already destabilizing the climate and fueling fiercer storms, droughts, and wildfires.

Copernicus monitors global temperatures using billions of satellite and weather readings dating back to 1940. This year, the most pronounced heat was seen in Western Europe, with southwest France and the Iberian Peninsula hardest hit. Other hot spots included Siberia, parts of Antarctica, China, the Korean Peninsula, Japan, and the Middle East.

Scientists warn that human-driven greenhouse gas emissions continue to push the planet toward increasingly frequent and extreme climate events. Record ocean temperatures in the North Atlantic and Mediterranean underscore the growing risk of intensifying heat-related disasters worldwide.