OpenUV UV Index API

openapi: 3.1.0
info:
  title: OpenUV Account UV Index API
  description: 'Global real-time UV index API. Returns current UV index, daily maximum UV, ozone level,

    safe sun-exposure times per Fitzpatrick skin type, sun position, and a recommended sun

    protection window for any geographic coordinate. All endpoints are GET-only and require

    an OpenUV API key supplied in the `x-access-token` header.

    '
  version: 1.0.0
  contact:
    name: OpenUV Support
    url: https://www.openuv.io
    email: support@openuv.io
  license:
    name: Proprietary
    url: https://www.openuv.io
servers:
- url: https://api.openuv.io/api/v1
  description: OpenUV Production
security:
- ApiKeyAuth: []
tags:
- name: UV Index
  description: Current and forecasted UV index data
paths:
  /uv:
    get:
      tags:
      - UV Index
      operationId: getCurrentUVIndex
      summary: Get Current UV Index
      description: 'Returns the current UV index, daily maximum UV, ozone level, sun position

        and Fitzpatrick skin-type-specific safe exposure times for the given coordinate.

        '
      parameters:
      - $ref: '#/components/parameters/Latitude'
      - $ref: '#/components/parameters/Longitude'
      - $ref: '#/components/parameters/Altitude'
      - $ref: '#/components/parameters/DateTime'
      responses:
        '200':
          description: Current UV index reading
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UVIndexResponse'
        '400':
          $ref: '#/components/responses/BadRequest'
        '403':
          $ref: '#/components/responses/Forbidden'
        '429':
          $ref: '#/components/responses/TooManyRequests'
  /forecast:
    get:
      tags:
      - UV Index
      operationId: getUVForecast
      summary: Get UV Index Forecast
      description: 'Returns a time-series UV index forecast for the given coordinate. Each entry

        contains the UV value, ISO 8601 timestamp and sun position at the forecast step.

        '
      parameters:
      - $ref: '#/components/parameters/Latitude'
      - $ref: '#/components/parameters/Longitude'
      - $ref: '#/components/parameters/Altitude'
      - $ref: '#/components/parameters/DateTime'
      responses:
        '200':
          description: Forecasted UV index series
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UVForecastResponse'
        '400':
          $ref: '#/components/responses/BadRequest'
        '403':
          $ref: '#/components/responses/Forbidden'
        '429':
          $ref: '#/components/responses/TooManyRequests'
components:
  responses:
    Forbidden:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error: User with API Key not found
    TooManyRequests:
      description: Daily quota exceeded.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            error: Daily API quota exceeded. Add billing details to get 15000 reqs/day or contact support@openuv.io to upgrade to Unlimited Plan.
    BadRequest:
      description: Invalid parameters.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    UVForecastEntry:
      type: object
      required:
      - uv
      - uv_time
      - sun_position
      properties:
        uv:
          type: number
          format: float
          description: Forecasted UV index at the step.
        uv_time:
          type: string
          format: date-time
          description: ISO 8601 timestamp for the forecast step.
        sun_position:
          $ref: '#/components/schemas/SunPosition'
    SunInfo:
      type: object
      properties:
        sun_times:
          $ref: '#/components/schemas/SunTimes'
        sun_position:
          $ref: '#/components/schemas/SunPosition'
    SafeExposureTime:
      type: object
      description: Minutes of safe unprotected sun exposure by Fitzpatrick skin type (st1 = lightest, st6 = darkest). Null when not applicable (e.g. night).
      properties:
        st1:
          type: integer
          nullable: true
          description: Skin Type 1 - Pale white skin, always burns.
        st2:
          type: integer
          nullable: true
          description: Skin Type 2 - White skin, usually burns.
        st3:
          type: integer
          nullable: true
          description: Skin Type 3 - Light brown skin, sometimes burns.
        st4:
          type: integer
          nullable: true
          description: Skin Type 4 - Moderate brown skin, rarely burns.
        st5:
          type: integer
          nullable: true
          description: Skin Type 5 - Dark brown skin, very rarely burns.
        st6:
          type: integer
          nullable: true
          description: Skin Type 6 - Deeply pigmented dark brown skin, never burns.
    UVIndex:
      type: object
      required:
      - uv
      - uv_time
      - uv_max
      - uv_max_time
      - ozone
      - ozone_time
      - safe_exposure_time
      - sun_info
      properties:
        uv:
          type: number
          format: float
          description: Current UV index at the requested time and coordinate.
          example: 8.2342
        uv_time:
          type: string
          format: date-time
          description: ISO 8601 timestamp of the UV reading.
        uv_max:
          type: number
          format: float
          description: Maximum UV index for the day at solar noon.
          example: 10.3335
        uv_max_time:
          type: string
          format: date-time
          description: ISO 8601 timestamp of the daily maximum UV (solar noon).
        ozone:
          type: number
          format: float
          description: Total column ozone in Dobson units (DU).
          example: 300.7
        ozone_time:
          type: string
          format: date-time
          description: ISO 8601 timestamp of the ozone reading.
        safe_exposure_time:
          $ref: '#/components/schemas/SafeExposureTime'
        sun_info:
          $ref: '#/components/schemas/SunInfo'
    UVForecastResponse:
      type: object
      required:
      - result
      properties:
        result:
          type: array
          items:
            $ref: '#/components/schemas/UVForecastEntry'
    UVIndexResponse:
      type: object
      required:
      - result
      properties:
        result:
          $ref: '#/components/schemas/UVIndex'
    SunTimes:
      type: object
      description: Solar event times for the day at the requested coordinate.
      properties:
        solarNoon:
          type: string
          format: date-time
        nadir:
          type: string
          format: date-time
        sunrise:
          type: string
          format: date-time
        sunset:
          type: string
          format: date-time
        sunriseEnd:
          type: string
          format: date-time
        sunsetStart:
          type: string
          format: date-time
        dawn:
          type: string
          format: date-time
        dusk:
          type: string
          format: date-time
        nauticalDawn:
          type: string
          format: date-time
        nauticalDusk:
          type: string
          format: date-time
        nightEnd:
          type: string
          format: date-time
        night:
          type: string
          format: date-time
        goldenHourEnd:
          type: string
          format: date-time
        goldenHour:
          type: string
          format: date-time
    Error:
      type: object
      required:
      - error
      properties:
        error:
          type: string
          description: Human-readable error message.
    SunPosition:
      type: object
      description: Position of the sun at the requested time and coordinate, in radians.
      properties:
        azimuth:
          type: number
          format: float
          description: Solar azimuth in radians from south, clockwise.
        altitude:
          type: number
          format: float
          description: Solar altitude in radians above the horizon.
  parameters:
    DateTime:
      name: dt
      in: query
      required: false
      description: ISO 8601 timestamp for the requested UV reading or forecast anchor. Defaults to the current time.
      schema:
        type: string
        format: date-time
        example: '2026-05-29T18:00:00.000Z'
    Altitude:
      name: alt
      in: query
      required: false
      description: Altitude in meters above sea level. Improves UV accuracy for high-elevation locations.
      schema:
        type: number
        format: float
        minimum: 0
        example: 1609
    Longitude:
      name: lng
      in: query
      required: true
      description: Longitude in decimal degrees (-180 to 180).
      schema:
        type: number
        format: float
        minimum: -180
        maximum: 180
        example: -104.9903
    Latitude:
      name: lat
      in: query
      required: true
      description: Latitude in decimal degrees (-90 to 90).
      schema:
        type: number
        format: float
        minimum: -90
        maximum: 90
        example: 39.7392
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-access-token
      description: OpenUV API key issued from https://www.openuv.io/console