Global water resources are shrinking, with reduced river discharge, shrinking glaciers, and falling groundwater levels in many regions, according to the World Meteorological Organization.

Groundwater data from 2025 show nearly two-thirds of monitored wells operating outside historical norms, with deficits increasing compared to 2024 rather than recovering.

2025 was among the driest years for rivers worldwide in more than three decades, raising alarms about water security.

The UN WMO warns the global water cycle is becoming increasingly unpredictable due to climate change and a potentially record-strength El Niño, bringing drought in some regions and heavy rainfall in others.

El Niño is anticipated to be the strongest on record, likely intensifying drought risks in certain areas while triggering floods in others.

The report synthesizes observations from more than 60 countries and characterizes 2025 as one of the warmest years on record, underscoring the global scope of water-cycle changes.

Data from 68 countries, over 3,000 stations and satellites show Asia and Africa bearing the majority of hydrological extremes and related fatalities in recent years.

The WMO released its report on September 17, 2026, warning about global water resources and projecting long-term risks for populations and economies.

Extreme dryness and irregular rainfall patterns are driving water scarcity and potential economic impacts.

Groundwater deficits are most pronounced in Central and Eastern Europe, while Northern Europe shows groundwater levels above long-term averages.

The report highlights a growing frequency of hydrological extremes as a key trend to monitor.

Glaciers and groundwater act as buffers for dry periods, and their depletion reduces resilience to drought and climate extremes.