Weather Underground

Weather Underground operates a personal weather station network of 250,000+ stations worldwide, providing hyperlocal weather data via a REST API. The PWS API (hosted at api.weather.com) offers authenticated access to current conditions, historical observations, 5-day forecasts, and location lookup for registered station contributors. API keys are free for PWS owners who upload data to the network.

Weather Underground publishes 4 API contracts indexed on the APIs.io network, including Forecast API, Historical API, Location API, and 1 more. Tagged areas include Weather, Personal Weather Stations, Hyperlocal, Observations, and Forecast.

The Weather Underground catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Weather Underground’s developer surface includes authentication, documentation, engineering blog, pricing, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.9/100 thin ▬ flat Agent 26/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreeSelf serve⚡ Free to try

1 published contract

WeatherPersonal Weather StationsHyperlocal Observations Forecast Historical Data REST API

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 34.9/100 · thin

Contract Quality 11.7 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 2.2 / 17

Operational Transparency 4.2 / 11

Contract Governance 1.0 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.4 / 15

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 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 4 / 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 Horizontal (data, software, accessibility, platform) 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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 Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →

5 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 12.8 — up to +17.4 composite points Ask about this →
Developer Ergonomics scores 23.8 — up to +15.2 composite points Ask about this →
Contract Quality scores 55.0 — up to +11.3 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/wunderground/apis.yml: open an issue on github.com/api-evangelist/wunderground 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 4

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

Weather Underground Forecast API

Weather forecasts based on PWS location

Weather Underground Historical API

Historical PWS observations and daily summaries

Weather Underground Location API

PWS station location lookup

Weather Underground Observations API

Current and real-time PWS observations

Open Collections 4

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

Weather Underground PWS Forecast API

OPEN COLLECTION

Weather Underground PWS Forecast Historical API

OPEN COLLECTION

Weather Underground PWS Forecast Location API

OPEN COLLECTION

Weather Underground PWS Forecast Observations API

OPEN COLLECTION

Weather Underground API pricing

Not yet checked against Weather Underground's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
PWS Contributor (Free)	Free

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Weather Underground Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Weather Underground Rate Limits

2 limits

RATE LIMITS

Service Levels 1

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

Weather Underground

SLA

FinOps 1

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

Weather Underground Finops

FINOPS

Semantic Vocabularies 1

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

Wunderground Context

0 classes · 66 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Weather Underground — jsonschema rules

5 rules · 3 warn-severity 2 info-severity

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

PWS Observation

20 properties

JSON SCHEMA

Examples 3

Example request and response payloads for these APIs.

5 Day Forecast

17 fields

EXAMPLE

Current Observations

1 fields

EXAMPLE

Daily Summary

1 fields

EXAMPLE

Security Posture 3

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

Weather Underground Authentication

apiKey · 1 scheme

SECURITY

Weather Underground Domain Security

TLSv1.3 · DMARC

SECURITY

Weather Underground Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Weather Underground Agentic Access

8 operations

8 operations · 0 acting

AGENTIC

Resources

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 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: wunderground
name: Weather Underground
description: 'Weather Underground operates a personal weather station network of 250,000+ stations worldwide, providing hyperlocal
  weather data via a REST API. The PWS API (hosted at api.weather.com) offers authenticated access to current conditions,
  historical observations, 5-day forecasts, and location lookup for registered station contributors. API keys are free for
  PWS owners who upload data to the network.

  '
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: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Free · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/wunderground.png
url: https://raw.githubusercontent.com/api-evangelist/wunderground/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- Weather
- Personal Weather Stations
- Hyperlocal
- Observations
- Forecast
- Historical Data
- REST API
tags_raw:
- Weather
- Personal Weather Stations
- Hyperlocal
- Observations
- Forecasts
- Historical Data
- REST API
apis:
- aid: wunderground:wunderground-forecast-api
  name: Weather Underground Forecast API
  description: Weather forecasts based on PWS location
  humanURL: https://www.wunderground.com/member/api-keys
  baseURL: https://api.weather.com
  tags:
  - Forecast
  properties:
  - type: OpenAPI
    url: openapi/wunderground-forecast-api-openapi.yml
  - type: Documentation
    url: https://www.wunderground.com/member/api-keys
- aid: wunderground:wunderground-historical-api
  name: Weather Underground Historical API
  description: Historical PWS observations and daily summaries
  humanURL: https://www.wunderground.com/member/api-keys
  baseURL: https://api.weather.com
  tags:
  - Historical
  properties:
  - type: OpenAPI
    url: openapi/wunderground-historical-api-openapi.yml
  - type: Documentation
    url: https://www.wunderground.com/member/api-keys
- aid: wunderground:wunderground-location-api
  name: Weather Underground Location API
  description: PWS station location lookup
  humanURL: https://www.wunderground.com/member/api-keys
  baseURL: https://api.weather.com
  tags:
  - Location
  properties:
  - type: OpenAPI
    url: openapi/wunderground-location-api-openapi.yml
  - type: Documentation
    url: https://www.wunderground.com/member/api-keys
- aid: wunderground:wunderground-observations-api
  name: Weather Underground Observations API
  description: Current and real-time PWS observations
  humanURL: https://www.wunderground.com/member/api-keys
  baseURL: https://api.weather.com
  tags:
  - Observations
  properties:
  - type: OpenAPI
    url: openapi/wunderground-observations-api-openapi.yml
  - type: Documentation
    url: https://www.wunderground.com/member/api-keys
common:
- type: AgenticAccess
  url: agentic-access/wunderground-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/wunderground-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/wunderground-domain-security.yml
- type: Authentication
  url: authentication/wunderground-authentication.yml
- type: Website
  url: https://www.wunderground.com
- type: Documentation
  url: https://www.wunderground.com/member/api-keys
- type: GitHubOrg
  url: https://github.com/topics/wunderground-api
- type: LinkedIn
  url: https://www.linkedin.com/company/wunderground-llc
- type: Blog
  url: https://www.wunderground.com/blog
- type: Pricing
  url: https://www.wunderground.com/member/api-keys
- type: StatusPage
  url: https://uptime.com/wunderground.com
- type: X
  url: https://x.com/wunderground
- type: Plans
  url: plans/wunderground-plans-pricing.yml
- type: RateLimits
  url: rate-limits/wunderground-rate-limits.yml
- type: FinOps
  url: finops/wunderground-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Weather Underground API — frequently asked questions

Does Weather Underground have an API?

Yes. APIs.io lists 4 APIs from Weather Underground, including Weather Underground Forecast API, Weather Underground Historical API and Weather Underground Location API, and 1 more.

Is there an OpenAPI specification for the Weather Underground API?

Yes. APIs.io indexes 4 OpenAPI specifications for Weather Underground, each linked for download from this page.

How do I authenticate with the Weather Underground API?

Weather Underground uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Weather Underground Authentication.

How much does the Weather Underground API cost?

APIs.io lists 1 pricing plan for Weather Underground, with each plan's price, limits and inclusions under Pricing on this page.

Is the Weather Underground API ready for AI agents?

Weather Underground has a Kin Score of 34.9 out of 100 (thin) and an Agent Readiness score of 25.5 (agent-aware), scored by API Evangelist on 2026-11-13.

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