openapi: 3.0.3
info:
  title: Tomorrow.io Weather Alerts Historical API
  description: Unified Tomorrow.io v4 HTTP API for weather and climate intelligence. Combines realtime observations, forecast timelines (minutely, hourly, daily, current), historical data up to 20 years, weather along a route, raster map tiles, plus management surfaces for Locations, Insights, Alerts, and Events.
  version: 4.0.1
  contact:
    name: Tomorrow.io Support
    url: https://www.tomorrow.io/support/
  license:
    name: Tomorrow.io Terms of Service
    url: https://www.tomorrow.io/terms-of-service/
  x-generated-from: documentation
  x-last-validated: '2026-05-30'
servers:
- url: https://api.tomorrow.io/v4
  description: Tomorrow.io v4 production API
security:
- apiKeyQuery: []
tags:
- name: Historical
  description: Historical weather data for a point or polygon, up to 20 years back.
paths:
  /historical:
    post:
      operationId: postHistoricalTimeline
      summary: Tomorrow.io Post Historical Timeline
      description: Returns historical weather timelines for a location, up to 20 years back.
      tags:
      - Historical
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/HistoricalRequest'
            examples:
              PostHistoricalTimelineRequestExample:
                summary: Default postHistoricalTimeline request
                x-microcks-default: true
                value:
                  fields:
                  - temperature
                  - precipitationIntensity
                  units: metric
                  timesteps:
                  - 1d
                  startTime: '2024-01-01T00:00:00Z'
                  endTime: '2024-01-31T23:59:59Z'
                  timezone: example
      responses:
        '200':
          description: Historical timeline response.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TimelinesResponse'
              examples:
                PostHistoricalTimeline200Example:
                  summary: Default postHistoricalTimeline 200 response
                  x-microcks-default: true
                  value:
                    data:
                      timelines:
                      - timestep: 1h
                        startTime: '2026-05-30T13:00:00Z'
                        endTime: '2026-05-30T13:00:00Z'
                        intervals:
                        - startTime: '2026-05-30T13:00:00Z'
                          values:
                            temperature: 21.2
                            temperatureApparent: 20.4
                            humidity: 64.0
                            dewPoint: 13.4
                            windSpeed: 3.1
                            windDirection: 220
                            windGust: 6.2
                            pressureSeaLevel: 1013.2
                            pressureSurfaceLevel: 1010.5
                            precipitationIntensity: 0.0
                            precipitationProbability: 5
                            precipitationType: 0
                            cloudCover: 12
                            cloudBase: 1.5
                            cloudCeiling: 2.4
                            visibility: 16
                            weatherCode: 1000
                            uvIndex: 6
                            uvHealthConcern: 2
                            epaIndex: 42
                            epaHealthConcern: 1
                            epaPrimaryPollutant: 0
                            particulateMatter25: 8.4
                            particulateMatter10: 14.1
                            pollutantO3: 28
                            pollutantNO2: 11
                            pollutantCO: 0.4
                            pollutantSO2: 1
                            treeIndex: 2
                            grassIndex: 1
                            weedIndex: 1
                            fireIndex: 8.2
                            solarGHI: 480
                            solarDIF: 120
                            solarDIR: 360
                            moonPhase: 3
                            hailBinary: 0
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  schemas:
    TimelinesResponse:
      type: object
      description: Tomorrow.io Timelines response envelope.
      properties:
        data:
          type: object
          properties:
            timelines:
              type: array
              items:
                $ref: '#/components/schemas/Timeline'
    HistoricalRequest:
      type: object
      description: Historical Timelines request body.
      properties:
        location:
          oneOf:
          - type: string
          - $ref: '#/components/schemas/GeoJSONGeometry'
        fields:
          type: array
          items:
            type: string
          example:
          - temperature
          - precipitationIntensity
        units:
          type: string
          enum:
          - metric
          - imperial
          default: metric
        timesteps:
          type: array
          items:
            type: string
            enum:
            - 1h
            - 1d
          example:
          - 1d
        startTime:
          type: string
          format: date-time
          example: '2024-01-01T00:00:00Z'
        endTime:
          type: string
          format: date-time
          example: '2024-01-31T23:59:59Z'
        timezone:
          type: string
          default: UTC
      required:
      - location
      - fields
      - startTime
      - endTime
    GeoJSONGeometry:
      type: object
      description: GeoJSON geometry — Point, LineString, or Polygon.
      properties:
        type:
          type: string
          enum:
          - Point
          - LineString
          - Polygon
          example: Point
        coordinates:
          type: array
          items: {}
          example:
          - -71.0466
          - 42.3478
      required:
      - type
      - coordinates
    Timeline:
      type: object
      description: One timeline at a specific resolution.
      properties:
        timestep:
          type: string
          example: 1h
        startTime:
          type: string
          format: date-time
        endTime:
          type: string
          format: date-time
        intervals:
          type: array
          items:
            $ref: '#/components/schemas/TimelineInterval'
    WeatherValues:
      type: object
      description: Map of weather data field names to numeric values for one timestep.
      additionalProperties: true
      properties:
        temperature:
          type: number
          format: double
          description: Air temperature (Celsius for metric, Fahrenheit for imperial).
          example: 21.2
        temperatureApparent:
          type: number
          format: double
          example: 20.4
        humidity:
          type: number
          format: double
          example: 64.0
        dewPoint:
          type: number
          format: double
          example: 13.4
        windSpeed:
          type: number
          format: double
          example: 3.1
        windDirection:
          type: number
          format: double
          example: 220
        windGust:
          type: number
          format: double
          example: 6.2
        pressureSeaLevel:
          type: number
          format: double
          example: 1013.2
        pressureSurfaceLevel:
          type: number
          format: double
          example: 1010.5
        precipitationIntensity:
          type: number
          format: double
          example: 0.0
        precipitationProbability:
          type: number
          format: double
          example: 5
        precipitationType:
          type: integer
          example: 0
        cloudCover:
          type: number
          format: double
          example: 12
        cloudBase:
          type: number
          format: double
          example: 1.5
        cloudCeiling:
          type: number
          format: double
          example: 2.4
        visibility:
          type: number
          format: double
          example: 16
        weatherCode:
          type: integer
          example: 1000
        uvIndex:
          type: integer
          example: 6
        uvHealthConcern:
          type: integer
          example: 2
        epaIndex:
          type: integer
          example: 42
        epaHealthConcern:
          type: integer
          example: 1
        epaPrimaryPollutant:
          type: integer
          example: 0
        particulateMatter25:
          type: number
          format: double
          example: 8.4
        particulateMatter10:
          type: number
          format: double
          example: 14.1
        pollutantO3:
          type: number
          format: double
          example: 28
        pollutantNO2:
          type: number
          format: double
          example: 11
        pollutantCO:
          type: number
          format: double
          example: 0.4
        pollutantSO2:
          type: number
          format: double
          example: 1
        treeIndex:
          type: integer
          example: 2
        grassIndex:
          type: integer
          example: 1
        weedIndex:
          type: integer
          example: 1
        fireIndex:
          type: number
          format: double
          example: 8.2
        solarGHI:
          type: number
          format: double
          example: 480
        solarDIF:
          type: number
          format: double
          example: 120
        solarDIR:
          type: number
          format: double
          example: 360
        moonPhase:
          type: integer
          example: 3
        hailBinary:
          type: integer
          example: 0
    TimelineInterval:
      type: object
      description: A single timestep entry in a timeline.
      properties:
        startTime:
          type: string
          format: date-time
          example: '2026-05-30T13:00:00Z'
        values:
          $ref: '#/components/schemas/WeatherValues'
    Error:
      type: object
      description: Standard Tomorrow.io error envelope.
      properties:
        code:
          type: integer
          example: 400001
          description: Internal error code.
        type:
          type: string
          example: Invalid Body Parameters
          description: Short error type label.
        message:
          type: string
          example: The provided parameters are invalid.
          description: Human-readable error message.
      required:
      - code
      - type
      - message
  responses:
    TooManyRequests:
      description: Rate limit exceeded.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: Malformed request.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    apiKeyQuery:
      type: apiKey
      in: query
      name: apikey
      description: Tomorrow.io API key passed as `apikey` query parameter. Obtain at https://app.tomorrow.io/development/keys.