World Meteorological Organization

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.

World Meteorological Organization publishes 9 API contracts indexed on the APIs.io network, including Jobs API, Pywcmp Wis2 Wcmp2 Ets API, Pywcmp Wis2 Wcmp2 Kpi API, and 6 more. Tagged areas include Weather, Climate, Hydrology, Meteorology, and International Organization.

The World Meteorological Organization catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

World Meteorological Organization’s developer surface includes engineering blog, developer portal, documentation, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

31.3/100 thin ▬ flat Agent 21/100 agent aware Front door AI 1/6 silent Heartbeat 97/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 published contract

Weather Climate Hydrology MeteorologyInternational OrganizationUnited Nations Open Data

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 31.3/100 · thin

Contract Quality 9.3 / 19

Developer Ergonomics 5.4 / 15

Access Clarity 2.8 / 15

Operational Transparency 0.3 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 2.2 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 18.4 — up to +16.3 composite points
Developer Ergonomics scores 35.7 — up to +12.9 composite points
Operational Transparency scores 2.6 — up to +12.7 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/wmo/apis.yml: open an issue on github.com/api-evangelist/wmo to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Weather and Climate Data	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

World Weather Information Service API

The WMO World Weather Information Service (WWIS) provides public JSON endpoints delivering official city weather forecasts and climatological data contributed by WMO member nati...

OSCAR/Surface REST API

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 ena...

WIS2 Global Broker (MQTT)

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...

WHOS Hydrological Observing System API

The WMO Hydrological Observing System (WHOS) provides multiple API interfaces for accessing global hydrological station data and time series. Available services include a REST/J...

World Meteorological Organization Jobs API

The jobs API from World Meteorological Organization — 3 operation(s) for jobs.

World Meteorological Organization Pywcmp Wis2 Wcmp2 Ets API

The pywcmp-wis2-wcmp2-ets API from World Meteorological Organization — 2 operation(s) for pywcmp-wis2-wcmp2-ets.

World Meteorological Organization Pywcmp Wis2 Wcmp2 Kpi API

The pywcmp-wis2-wcmp2-kpi API from World Meteorological Organization — 2 operation(s) for pywcmp-wis2-wcmp2-kpi.

World Meteorological Organization Server API

Meteorological Service of Canada Global Discovery Catalogue (GDC)

World Meteorological Organization Wis2 Discovery Metadata API

WIS2 discovery metadata

Scroll for all 9

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Meteorological Service of Canada Global Discovery Catalogue (GDC) jobs API

OPEN COLLECTION

Meteorological Service of Canada Global Discovery Catalogue (GDC) jobs pywcmp-wis2-wcmp2-ets API

OPEN COLLECTION

Meteorological Service of Canada Global Discovery Catalogue (GDC) jobs pywcmp-wis2-wcmp2-kpi API

OPEN COLLECTION

Meteorological Service of Canada Global Discovery Catalogue (GDC) jobs server API

OPEN COLLECTION

Meteorological Service of Canada Global Discovery Catalogue (GDC) jobs wis2-discovery-metadata API

OPEN COLLECTION

World Meteorological Organization API pricing

Not yet checked against World Meteorological Organization's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure.

Plan	Price
Open Access (No Authentication)	—
Free Registration (Token Required)	—
Public Read-Only (OSCAR)	—
Public MQTT Subscription (WIS2 Global Broker)	—

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Plans

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

0 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

World Meteorological Organization

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Apis Context

0 classes · 0 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

World Meteorological Organization API Rules

57 rules · 51 errors 2 warnings 4 info

SPECTRAL

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Wmo Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Wmo Agentic Access

21 operations · 3 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Community

Community

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

TermsOfService

TermsOfService

Company 4

The organization behind the API

Blog

Blog

Website

Website

Twitter

Twitter

LinkedIn

Other 1

Properties that don't map to a standard resource type

SevereWeatherAlerts

SevereWeatherAlerts

Source (apis.yml)

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
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/wmo.png
url: https://raw.githubusercontent.com/api-evangelist/wmo/refs/heads/main/apis.yml
created: '2024-01-01'
modified: '2026-10-06'
specificationVersion: '0.23'
x-docs-platform: readthedocs
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-17
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
  - Forecast
  - Climate
  tags_raw:
  - 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-broker-mqtt-api
  name: WIS2 Global Broker (MQTT)
  tags:
  - WIS2
  - Real-Time
  - MQTT
  - Pub/Sub
  - Notification
  tags_raw:
  - 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.
- aid: wmo:wmo-jobs-api
  name: World Meteorological Organization Jobs API
  description: The jobs API from World Meteorological Organization — 3 operation(s) for jobs.
  humanURL: https://worldweather.wmo.int/en/dataguide.html
  baseURL: https://worldweather.wmo.int/en/json/
  tags:
  - Job
  tags_raw:
  - jobs
  properties:
  - type: OpenAPI
    url: openapi/wmo-jobs-api-openapi.yml
  - type: Documentation
    url: https://wis2-gdc.weather.gc.ca/collections/wis2-discovery-metadata/items
- aid: wmo:wmo-pywcmp-wis2-wcmp2-ets-api
  name: World Meteorological Organization Pywcmp Wis2 Wcmp2 Ets API
  description: The pywcmp-wis2-wcmp2-ets API from World Meteorological Organization — 2 operation(s) for pywcmp-wis2-wcmp2-ets.
  humanURL: https://worldweather.wmo.int/en/dataguide.html
  baseURL: https://worldweather.wmo.int/en/json/
  tags:
  - pywcmp-wis2-wcmp2-ets
  properties:
  - type: OpenAPI
    url: openapi/wmo-pywcmp-wis2-wcmp2-ets-api-openapi.yml
  - type: Documentation
    url: https://wis2-gdc.weather.gc.ca/collections/wis2-discovery-metadata/items
- aid: wmo:wmo-pywcmp-wis2-wcmp2-kpi-api
  name: World Meteorological Organization Pywcmp Wis2 Wcmp2 Kpi API
  description: The pywcmp-wis2-wcmp2-kpi API from World Meteorological Organization — 2 operation(s) for pywcmp-wis2-wcmp2-kpi.
  humanURL: https://worldweather.wmo.int/en/dataguide.html
  baseURL: https://worldweather.wmo.int/en/json/
  tags:
  - pywcmp-wis2-wcmp2-kpi
  properties:
  - type: OpenAPI
    url: openapi/wmo-pywcmp-wis2-wcmp2-kpi-api-openapi.yml
  - type: Documentation
    url: https://wis2-gdc.weather.gc.ca/collections/wis2-discovery-metadata/items
- aid: wmo:wmo-server-api
  name: World Meteorological Organization Server API
  description: Meteorological Service of Canada Global Discovery Catalogue (GDC)
  humanURL: https://worldweather.wmo.int/en/dataguide.html
  baseURL: https://worldweather.wmo.int/en/json/
  tags:
  - Servers
  tags_raw:
  - server
  properties:
  - type: OpenAPI
    url: openapi/wmo-server-api-openapi.yml
  - type: Documentation
    url: https://wis2-gdc.weather.gc.ca/collections/wis2-discovery-metadata/items
- aid: wmo:wmo-wis2-discovery-metadata-api
  name: World Meteorological Organization Wis2 Discovery Metadata API
  description: WIS2 discovery metadata
  humanURL: https://worldweather.wmo.int/en/dataguide.html
  baseURL: https://worldweather.wmo.int/en/json/
  tags:
  - wis2-discovery-metadata
  properties:
  - type: OpenAPI
    url: openapi/wmo-wis2-discovery-metadata-api-openapi.yml
  - type: Documentation
    url: https://wis2-gdc.weather.gc.ca/collections/wis2-discovery-metadata/items
common:
- type: Plans
  url: plans/plans.yml
- type: RateLimits
  url: rate-limits/rate-limits.yml
- type: FinOps
  url: finops/finops.yml
- url: https://wmo.int/news
  type: Blog
- type: AgenticAccess
  url: agentic-access/wmo-agentic-access.yml
- type: DomainSecurity
  url: security/wmo-domain-security.yml
- 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

World Meteorological Organization API — frequently asked questions

Does World Meteorological Organization have an API?

Yes. APIs.io lists 9 APIs from World Meteorological Organization, including World Weather Information Service API, OSCAR/Surface REST API and WIS2 Global Broker (MQTT), and 6 more.

Is there an OpenAPI specification for the World Meteorological Organization API?

Yes. APIs.io indexes 5 OpenAPI specifications for World Meteorological Organization, each linked for download from this page.

How much does the World Meteorological Organization API cost?

APIs.io lists 4 pricing plans for World Meteorological Organization, with each plan's price, limits and inclusions under Pricing on this page.

Is the World Meteorological Organization API ready for AI agents?

World Meteorological Organization has a Kin Score of 31.3 out of 100 (thin) and an Agent Readiness score of 21.3 (agent-aware), scored by API Evangelist on 2026-11-06.

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