Tomorrow.io

Tomorrow.io Forecast API

Hourly and daily forecast timelines via a simple GET interface.

GitHub OpenAPI

Documentation

📖
Documentation
https://docs.tomorrow.io/reference/welcome
📖
Authentication
https://app.tomorrow.io/development/keys

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/tomorrow/refs/heads/main/openapi/tomorrow-forecast-api-openapi.yml

Code Examples

💻
CodeExamples
https://github.com/Tomorrow-IO-API/tomorrow-samples
💻
CodeExamples
https://github.com/Tomorrow-IO-API/tomorrow-route-mapbox
💻
CodeExamples
https://github.com/Tomorrow-IO-API/tomorrow-timelines-widget
💻
CodeExamples
https://github.com/Tomorrow-IO-API/tomorrow-events-charts
💻
CodeExamples
https://github.com/Tomorrow-IO-API/tomorrow-api-proxy
💻
CodeExamples
https://github.com/Tomorrow-IO-API/tomorrow-netlify
💻
CodeExamples
https://github.com/Tomorrow-IO-API/climate-normals

Other Resources

🔗
Postman
https://github.com/Tomorrow-IO-API/tomorrow-postman
🔗
Signup
https://app.tomorrow.io/signup
🔗
WeatherIcons
https://github.com/Tomorrow-IO-API/tomorrow-weather-codes
🔗
MapAssets
https://github.com/Tomorrow-IO-API/tomorrow-map-spectrums

OpenAPI Specification

tomorrow-forecast-api-openapi.yml Raw ↑ 
openapi: 3.0.3
info:
  title: Tomorrow.io Weather Alerts Forecast 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: Forecast
  description: Hourly and daily forecast timelines via a simple GET interface.
paths:
  /weather/forecast:
    get:
      operationId: getWeatherForecast
      summary: Tomorrow.io Get Weather Forecast
      description: Returns hourly and daily forecast timelines for a single location.
      tags:
      - Forecast
      parameters:
      - name: location
        in: query
        required: true
        description: Place name, latlong array, GeoJSON, or saved location ID.
        schema:
          type: string
        example: new york
      - name: timesteps
        in: query
        required: false
        description: Comma-separated forecast resolutions.
        schema:
          type: array
          items:
            type: string
            enum:
            - 1h
            - 1d
            - current
          default:
          - 1h
          - 1d
        example: 1h,1d
      - name: units
        in: query
        required: false
        schema:
          type: string
          enum:
          - metric
          - imperial
          default: metric
      responses:
        '200':
          description: Forecast timelines.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ForecastResponse'
              examples:
                GetWeatherForecast200Example:
                  summary: Default getWeatherForecast 200 response
                  x-microcks-default: true
                  value:
                    timelines:
                      hourly:
                      - 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
                      daily:
                      - 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
                    location:
                      lat: 1.0
                      lon: 1.0
                      name: example
        '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:
    ForecastResponse:
      type: object
      properties:
        timelines:
          type: object
          properties:
            hourly:
              type: array
              items:
                $ref: '#/components/schemas/TimelineInterval'
            daily:
              type: array
              items:
                $ref: '#/components/schemas/TimelineInterval'
        location:
          type: object
          properties:
            lat:
              type: number
              format: double
            lon:
              type: number
              format: double
            name:
              type: string
    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
  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.