Weather Underground Observations API

openapi: 3.0.3
info:
  title: Weather Underground PWS Forecast Observations API
  description: 'REST API for Personal Weather Station (PWS) data provided by Weather Underground (hosted at api.weather.com). Provides current conditions, daily summaries, hourly and daily historical records, 5-day forecasts, and station location lookup. Access requires a free API key issued to registered PWS contributors.

    '
  version: 2.0.0
  contact:
    url: https://www.wunderground.com/member/api-keys
  termsOfService: https://www.wunderground.com/member/api-keys
  x-api-evangelist-ratings:
    design: 7
    documentation: 5
    authentication: 7
    openapi: 1
servers:
- url: https://api.weather.com
  description: Weather Underground / The Weather Company API server
security:
- apiKey: []
tags:
- name: Observations
  description: Current and real-time PWS observations
paths:
  /v2/pws/observations/current:
    get:
      operationId: getCurrentObservations
      summary: Get current observations for a PWS station
      description: 'Returns the current weather conditions observations for a specified Personal Weather Station. Includes temperature, humidity, wind, pressure, precipitation, UV index, and solar radiation.

        '
      tags:
      - Observations
      parameters:
      - $ref: '#/components/parameters/stationId'
      - $ref: '#/components/parameters/format'
      - $ref: '#/components/parameters/units'
      - $ref: '#/components/parameters/numericPrecision'
      responses:
        '200':
          description: Successful current observations response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CurrentObservationsResponse'
              example:
                observations:
                - stationID: KCASARAT1
                  obsTimeUtc: '2024-01-15T18:32:00Z'
                  obsTimeLocal: '2024-01-15 10:32:00'
                  neighborhood: Downtown
                  softwareType: WeatherBridge
                  country: US
                  solarRadiation: 320.5
                  lon: -122.419
                  realtimeFrequency: null
                  epoch: 1705343520
                  lat: 37.774
                  uv: 3.0
                  winddir: 270
                  humidity: 68
                  qcStatus: 1
                  imperial:
                    temp: 55.0
                    heatIndex: 55.0
                    dewpt: 44.0
                    windChill: 55.0
                    windSpeed: 8.0
                    windGust: 12.0
                    pressure: 30.05
                    precipRate: 0.0
                    precipTotal: 0.0
                    elev: 52.0
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /v2/pws/observations/all/1day:
    get:
      operationId: getAllObservations1Day
      summary: Get all observations for the current day
      description: 'Returns all rapid-fire observation records for a specified Personal Weather Station for the current day (up to 1 day of data). Useful for tracking real-time conditions throughout the day.

        '
      tags:
      - Observations
      parameters:
      - $ref: '#/components/parameters/stationId'
      - $ref: '#/components/parameters/format'
      - $ref: '#/components/parameters/units'
      - $ref: '#/components/parameters/numericPrecision'
      responses:
        '200':
          description: Successful response with all current day observations
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ObservationsListResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  schemas:
    ObservationsListResponse:
      type: object
      description: Response containing a list of PWS observations over a time period
      properties:
        observations:
          type: array
          items:
            $ref: '#/components/schemas/Observation'
          description: Array of observation records ordered by time
    Observation:
      type: object
      description: A single weather observation record from a PWS station
      properties:
        stationID:
          type: string
          description: Unique identifier of the PWS station
          example: KCASARAT1
        obsTimeUtc:
          type: string
          format: date-time
          description: Observation timestamp in UTC
          example: '2024-01-15T18:32:00Z'
        obsTimeLocal:
          type: string
          description: Observation timestamp in local station time
          example: '2024-01-15 10:32:00'
        neighborhood:
          type: string
          description: Neighborhood or location name for the station
          example: Downtown
        softwareType:
          type: string
          description: Software used to upload data to the network
          example: WeatherBridge
        country:
          type: string
          description: ISO 3166-1 alpha-2 country code of the station
          example: US
        solarRadiation:
          type: number
          description: Solar radiation intensity in W/m²
          example: 320.5
        lon:
          type: number
          format: double
          description: Station longitude in decimal degrees
          example: -122.419
        lat:
          type: number
          format: double
          description: Station latitude in decimal degrees
          example: 37.774
        uv:
          type: number
          description: UV index value
          example: 3.0
        winddir:
          type: integer
          description: Wind direction in degrees (0–360)
          example: 270
        windDirectionCardinal:
          type: string
          description: Wind direction as a compass cardinal or intercardinal point
          example: W
        humidity:
          type: integer
          description: Relative humidity percentage
          example: 68
        epoch:
          type: integer
          description: Unix timestamp of the observation
          example: 1705343520
        qcStatus:
          type: integer
          description: Quality control status flag (1 = passed QC)
          example: 1
        realtimeFrequency:
          type: integer
          nullable: true
          description: Realtime upload frequency in seconds, if applicable
          example: null
        imperial:
          $ref: '#/components/schemas/UnitMeasurements'
        metric:
          $ref: '#/components/schemas/UnitMeasurements'
        uk_hybrid:
          $ref: '#/components/schemas/UnitMeasurements'
        metric_si:
          $ref: '#/components/schemas/UnitMeasurements'
    UnitMeasurements:
      type: object
      description: 'Measurement values scoped to the requested unit system. The property name matches the units parameter value (e.g., "imperial", "metric", "uk_hybrid", or "metric_si").

        '
      properties:
        temp:
          type: number
          description: Air temperature
          example: 55.0
        heatIndex:
          type: number
          description: Apparent temperature accounting for humidity
          example: 55.0
        dewpt:
          type: number
          description: Dew point temperature
          example: 44.0
        windChill:
          type: number
          description: Wind chill temperature
          example: 55.0
        windSpeed:
          type: number
          description: Average wind speed
          example: 8.0
        windGust:
          type: number
          description: Peak wind gust speed
          example: 12.0
        pressure:
          type: number
          description: Atmospheric pressure (inHg for imperial, mbar for metric)
          example: 30.05
        precipRate:
          type: number
          description: Current precipitation rate per hour
          example: 0.0
        precipTotal:
          type: number
          description: Accumulated daily precipitation total
          example: 0.12
        elev:
          type: number
          description: Station elevation above sea level
          example: 52.0
    ErrorResponse:
      type: object
      description: Error response from the API
      properties:
        errors:
          type: array
          items:
            type: object
            properties:
              error:
                type: object
                properties:
                  code:
                    type: string
                    description: Error code
                    example: NOT-AUTHORIZED
                  message:
                    type: string
                    description: Human-readable error message
                    example: Not Authorized
    CurrentObservationsResponse:
      type: object
      description: Response containing current PWS observations
      properties:
        observations:
          type: array
          items:
            $ref: '#/components/schemas/Observation'
          description: Array of current observation records (typically one item)
  parameters:
    format:
      name: format
      in: query
      required: false
      description: Response format. Only JSON is currently supported.
      schema:
        type: string
        enum:
        - json
        default: json
    numericPrecision:
      name: numericPrecision
      in: query
      required: false
      description: 'When set to "decimal", numeric values are returned with decimal precision instead of rounded integers.

        '
      schema:
        type: string
        enum:
        - decimal
        example: decimal
    units:
      name: units
      in: query
      required: false
      description: 'Unit system for measurement values. e = Imperial (English), m = Metric, s = SI (metric with Pa pressure), h = Hybrid (UK)

        '
      schema:
        type: string
        enum:
        - e
        - m
        - s
        - h
        default: m
        example: e
    stationId:
      name: stationId
      in: query
      required: true
      description: 'The PWS station identifier (e.g., KCASARAT1). Station IDs are assigned upon registration with Weather Underground''s PWS network.

        '
      schema:
        type: string
        example: KCASARAT1
  responses:
    Unauthorized:
      description: 'Authentication failed. The API key is missing, invalid, or not authorized for the requested station or endpoint.

        '
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    NotFound:
      description: 'The requested station ID was not found or has no data for the specified date range.

        '
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    apiKey:
      type: apiKey
      in: query
      name: apiKey
      description: 'API key issued to registered PWS contributors via https://www.wunderground.com/member/api-keys

        '