The World Meteorological Organization (WMO) is a specialized agency of the United Nations that coordinates global meteorological, climatological, hydrological, and related geophysical sciences.
The WMO World Weather Information Service (WWIS) provides public JSON endpoints delivering official city weather forecasts and climatological data contributed by WMO member national meteorological and hydrological services.
The OSCAR/Surface REST API provides programmatic access to the WMO Observing Systems Capability Analysis and Review tool for surface-based stations.
The WIS2 Global Discovery Catalogue (GDC) implements the OGC API - Records standard to provide discovery metadata for datasets published across the WMO Information System 2.0 network.
The WIS2 Global Broker provides an MQTT(S) publish-subscribe service that re-publishes real-time weather notification messages from all WIS2 Nodes worldwide.
The WMO Hydrological Observing System (WHOS) provides multiple API interfaces for accessing global hydrological station data and time series.