Tomorrow.io Realtime API

openapi: 3.0.3
info:
  title: Tomorrow.io Weather Alerts Realtime 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: Realtime
  description: Current-conditions snapshot for a single location.
paths:
  /weather/realtime:
    get:
      operationId: getRealtimeWeather
      summary: Tomorrow.io Get Realtime Weather
      description: Returns the current observed weather for a single location.
      tags:
      - Realtime
      parameters:
      - name: location
        in: query
        required: true
        description: Place name, latlong array as `lat,lng`, GeoJSON, or a saved location ID.
        schema:
          type: string
        example: 42.3478,-71.0466
      - name: units
        in: query
        required: false
        description: Unit system for returned values.
        schema:
          type: string
          enum:
          - metric
          - imperial
          default: metric
        example: metric
      responses:
        '200':
          description: Realtime weather snapshot.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RealtimeWeatherResponse'
              examples:
                GetRealtimeWeather200Example:
                  summary: Default getRealtimeWeather 200 response
                  x-microcks-default: true
                  value:
                    data:
                      time: '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
                    location:
                      lat: 42.3478
                      lon: -71.0466
                      name: Cambridge, MA
                      type: place
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  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'
  schemas:
    RealtimeWeatherResponse:
      type: object
      properties:
        data:
          type: object
          properties:
            time:
              type: string
              format: date-time
              example: '2026-05-30T13:00:00Z'
            values:
              $ref: '#/components/schemas/WeatherValues'
        location:
          type: object
          properties:
            lat:
              type: number
              format: double
              example: 42.3478
            lon:
              type: number
              format: double
              example: -71.0466
            name:
              type: string
              example: Cambridge, MA
            type:
              type: string
              example: place
    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
    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
  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.