OpenUV API

⭐ Beginner's Pick Weather / API Key Intermediate HTTPS
Varies by plan (check documentation)

Overview

OpenUV provides real-time UV Index forecasts for any location on Earth, helping you understand sun exposure risks. It delivers hourly UV index data including safe exposure times and ozone levels. Beginners can use it to build sun safety apps or integrate UV alerts into weather dashboards.

💡

Beginner Tip

Register at openuv.io to get a free API key with 500 requests/day. Use latitude and longitude coordinates to query any location worldwide.

Available Data

temperature
weather conditions
humidity
wind speed
forecast data
Use case: Integrate real-time uv index forecast data into web and mobile applications

Example Response

JSON Response
{
  "location": "Tokyo",
  "temperature": {
    "current": 22,
    "feels_like": 24,
    "min": 18,
    "max": 26
  },
  "condition": "Partly Cloudy",
  "humidity": 65,
  "wind": {
    "speed": 12,
    "direction": "NE"
  },
  "forecast": [
    {
      "date": "2025-01-16",
      "high": 25,
      "low": 17,
      "condition": "Sunny"
    }
  ]
}

Field Reference

uv Current UV index value at the requested location (0 = no UV, 11+ = extreme)
uv_time ISO 8601 timestamp when the UV reading was recorded
uv_max Predicted maximum UV index for the day
uv_max_time Time of day when the maximum UV index is expected
ozone Current ozone level in Dobson Units, which affects UV radiation reaching the surface
safe_exposure_time Estimated safe sun exposure times (in minutes) for different skin types (st1 through st6)

Implementation Example

const url = "https://www.openuv.io/";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
  headers: {
  "X-API-Key": "YOUR_API_KEY"
  }
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

403 Forbidden Invalid or missing x-access-token header
Pass your API key in the x-access-token request header, not as a query parameter
429 Too Many Requests Exceeded the free tier limit of 500 requests per day
Cache UV data and refresh only once per hour since UV index changes slowly
Empty response or null uv field Night-time query where UV index is 0 or location is in polar darkness
Check the uv_time field to confirm the measurement time and handle 0 values explicitly in your app

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 10/20
🔒 Security 15/15
🛠 Developer XP 12/20
✓ Reliability 10/15

Partially tested on Apr 5, 2026

Technical Specifications

Auth API Key
HTTPS REQUIRED
CORS UNKNOWN
Category Weather
Difficulty Intermediate
Verified: 2026-04-04

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