Hong Kong Obervatory API
Overview
The Hong Kong Observatory Open Data API provides free access to weather observations, forecasts, earthquake reports, and climate data for Hong Kong and the surrounding region. No authentication is required — you can call it directly from any application without signing up. It is a great no-cost option for learning API integration while building weather apps for the Hong Kong area.
Beginner Tip
No API key is needed — just call the endpoint URLs directly. Use the dataType query parameter to select the data product you want, such as rhrread for hourly readings or fnd for a 9-day forecast.
Available Data
Example 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
temperature.data[].value Air temperature in degrees Celsius recorded at a specific station. humidity.data[].value Relative humidity percentage at a weather station. rainfall.data[].max Maximum rainfall recorded in millimetres during the observation period. updateTime ISO 8601 timestamp of when this data was last updated by HKO. warningMessage List of active weather warning messages issued by the Observatory. Implementation Example
const url = "https://www.hko.gov.hk/en/abouthko/";
const response = await fetch(url);
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
Matrix Score Breakdown
Fully tested on Apr 5, 2026
Technical Specifications
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