World Meteorological Organization

aid: wmo
name: World Meteorological Organization
description: The World Meteorological Organization (WMO) is a specialized agency of the United Nations that coordinates global
  meteorological, climatological, hydrological, and related geophysical sciences. WMO provides public REST APIs for weather
  data, climate observation metadata, hydrological monitoring, severe weather alerts, and the WIS2 global meteorological information
  exchange system enabling real-time access to earth system data from member nations worldwide.
type: Index
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
url: https://raw.githubusercontent.com/api-evangelist/wmo/refs/heads/main/apis.yml
created: '2024-01-01'
modified: '2026-06-13'
specificationVersion: '0.19'
tags:
- Weather
- Climate
- Hydrology
- Meteorology
- International Organization
- United Nations
- Open Data
apis:
- aid: wmo:world-weather-information-service-api
  name: World Weather Information Service API
  tags:
  - Weather
  - Forecasts
  - Climate
  humanURL: https://worldweather.wmo.int/en/dataguide.html
  baseURL: https://worldweather.wmo.int/en/json/
  properties:
  - url: https://worldweather.wmo.int/en/dataguide.html
    type: Documentation
  description: 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. Data is
    freely accessible by city identifier with no authentication required. City forecasts include temperature, wind, humidity,
    and precipitation; climatological normals cover monthly averages. A full city list with identifiers is available for programmatic
    enumeration of supported locations.
- aid: wmo:oscar-surface-api
  name: OSCAR/Surface REST API
  tags:
  - Observations
  - Weather Stations
  - WIGOS
  - Metadata
  humanURL: https://oscar.wmo.int/surface/
  baseURL: https://oscar.wmo.int/surface/rest/api
  properties:
  - url: https://oscar.wmo.int/surface/
    type: Documentation
  - url: https://oscar.wmo.int/surface/rest/api?_wadl
    type: WADL
  description: The OSCAR/Surface REST API provides programmatic access to the WMO Observing Systems Capability Analysis and
    Review tool for surface-based stations. The public GET endpoints enable search and retrieval of station metadata records
    in JSON format covering WIGOS station identifiers, station locations, observation variables, and operational status. The
    search station endpoint supports pagination with up to 50,000 station records per query. Authentication tokens are required
    for write (POST/XML upload) operations but not for read access.
- aid: wmo:wis2-global-discovery-catalogue-api
  name: WIS2 Global Discovery Catalogue API
  tags:
  - WIS2
  - Discovery
  - Metadata
  - OGC
  - Catalogue
  humanURL: https://wis2-gdc.weather.gc.ca
  baseURL: https://wis2-gdc.weather.gc.ca
  properties:
  - url: https://wis2-gdc.weather.gc.ca/collections/wis2-discovery-metadata/items
    type: Documentation
  - url: https://wis2-gdc.weather.gc.ca
    type: OpenAPI
  - url: https://raw.githubusercontent.com/api-evangelist/wmo/refs/heads/main/openapi/wis2-global-discovery-catalogue-openapi.json
    type: OpenAPI
  description: 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 primary hosted instance is operated by the Meteorological
    Service of Canada (MSC). The API supports free-text search, spatial bounding-box filtering (bbox), temporal filtering
    (ISO 8601 datetime), and pagination via limit and offset parameters. Records conform to the WMO Core Metadata Profile
    2 (WCMP2) standard and are returned in GeoJSON or HTML. WIS2 officially entered operational phase on January 1, 2025.
- aid: wmo:wis2-global-broker-mqtt-api
  name: WIS2 Global Broker (MQTT)
  tags:
  - WIS2
  - Real-time
  - MQTT
  - Pub/Sub
  - Notifications
  humanURL: https://community.wmo.int/site/knowledge-hub/programmes-and-initiatives/wmo-information-system-wis/wis2-overview
  baseURL: mqtts://globalbroker.meteo.fr:8883
  properties:
  - url: https://community.wmo.int/site/knowledge-hub/programmes-and-initiatives/wmo-information-system-wis/wis2-overview
    type: Documentation
  - url: https://wmo-im.github.io/wis2-cookbook/cookbook/wis2-cookbook-DRAFT.html
    type: GettingStarted
  description: 'The WIS2 Global Broker provides an MQTT(S) publish-subscribe service that re-publishes real-time weather notification
    messages from all WIS2 Nodes worldwide. Subscribers connect using MQTTS on port 8883 with public read-only credentials
    (username: everyone, password: everyone). Notification messages include data download links for core weather observations,
    forecasts, climate data, and alerts exchanged between WMO member nations under the WIS2 topic hierarchy.'
- aid: wmo:whos-hydrological-api
  name: WHOS Hydrological Observing System API
  tags:
  - Hydrology
  - Water
  - Observations
  - Time Series
  humanURL: https://community.wmo.int/whos-web-services-and-supported-tools
  baseURL: https://whos.geodab.eu/gs-service/services/essi
  properties:
  - url: https://community.wmo.int/whos-web-services-and-supported-tools
    type: Documentation
  description: The WMO Hydrological Observing System (WHOS) provides multiple API interfaces for accessing global hydrological
    station data and time series. Available services include a REST/JSON DAB Observation and Measurement API, an OGC Sensor
    Observation Service (SOS), CUAHSI WaterML endpoints for compatibility with HydroDesktop and R WaterML libraries, and an
    ESRI Feature Server. All endpoints require a personal access token obtained via free registration at the WHOS registration
    portal. Supported views include whos-arctic, whos-plata, and the global whos view.
common:
- type: Website
  url: https://wmo.int/
- type: GitHubOrganization
  url: https://github.com/World-Meteorological-Organization
- type: GitHubOrganization
  url: https://github.com/wmo-im
- type: Community
  url: https://community.wmo.int/
- type: Portal
  url: https://wmo.int/activities/type-of-activity/exchange-data
- type: Documentation
  url: https://docs.wis2box.wis.wmo.int/en/latest/
- type: SevereWeatherAlerts
  url: https://severeweather.wmo.int/
- type: Twitter
  url: https://twitter.com/WMO
- type: LinkedIn
  url: https://www.linkedin.com/company/world-meteorological-organization-wmo/
- type: TermsOfService
  url: https://worldweather.wmo.int/en/dataguide.html
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com