The World Meteorological Organization’s assessment of Asia’s climate in 2025 describes a year marked by record ocean heat, the region’s highest sea level since satellite measurements began and mass loss from all 23 monitored glaciers in High Mountain Asia. The World Meteorological Organization’s assessment, published on June 17, 2026, brings those measurements together with the year’s most severe impacts.
Heat reached across Asia’s land and sea
Ocean heat content reached a new record in the Asian region. Marine heatwaves affected almost the entire Asian ocean area, with more than 10 million square kilometres affected between July and September. That scale makes the 2025 signal regional rather than an isolated event affecting only a few coastlines.
National seasonal records show how widely the heat was felt on land. Japan, China and the Republic of Korea each recorded their hottest summer ever measured in 2025. Across Asia as a whole, the year ranked between the second and fourth hottest on record, depending on the dataset used. The range is important because it means the continent does not have one universally fixed ranking across all measurement systems.
The WMO comparison also places 2025 within a longer shift. Between 1991 and 2025, Asia warmed at approximately twice the rate observed between 1961 and 1990. That figure describes the change in the region’s warming pace between two periods; it does not mean every country or season experienced the same increase.
Glacier loss and sea-level rise varied by location
All 23 glaciers monitored in High Mountain Asia lost mass during the 2025 glaciological year. The WMO associates that loss in part with below-average winter snowfall and above-average temperatures. The result applies to the monitored group, not automatically to every glacier across the region, but it adds an important high-mountain indicator to the year’s climate record.
Sea level across Asia reached its highest point since satellite measurements began in 1999. The regional figure conceals substantial differences along the coast: from 1999 to 2025, the average rise was about 4.9 millimetres per year along the Indian coast and more than 6 millimetres per year in the Kuroshio Current region. Those rates point to different local exposure even when the wider region is described by a single record.
Floods turned the measurements into immediate losses
The assessment also connects the climate indicators with documented human and economic damage. Pakistan’s monsoon floods were associated with more than 1,000 deaths and left more than 3 million people needing assistance. In Viet Nam, prolonged flooding linked to several weather systems caused at least 200 deaths and $1.9 billion in economic losses.
Tropical Cyclone Ditwah delivered about 10% of Sri Lanka’s usual annual rainfall in 24 hours. It caused more than 640 deaths, displaced more than 200,000 people and produced estimated losses equivalent to about 4% of the country’s gross domestic product.
Taken together, the WMO assessment records heat, ice loss, sea-level change and flooding within the same year across Asia. It reports measured conditions and documented impacts, not a forecast for every location or a guarantee that the next season will repeat them. The concrete finding is that regional climate signals are already appearing alongside losses measured in lives, displacement and money.
