Hong Kong Obervatory

About Hong Kong Obervatory

The Hong Kong Observatory's open data portal provides access to a large collection of meteorological, tidal, astronomical, and seismic datasets covering Hong Kong territory. Datasets include current weather reports, 9-day forecasts, weather warnings, and local weather forecasts, alongside climate records such as daily temperature, rainfall, humidity, pressure, cloud cover, and sunshine duration. Update frequencies vary by dataset, ranging from every 5-15 minutes for real-time observations to hourly, daily, monthly, or yearly for aggregated and historical records.

Beyond core weather data, the portal offers specialized datasets including lightning counts, UV index readings, tropical cyclone track and best-track data, earthquake and earth tremor reports, tidal predictions and real-time tidal levels, sunrise/sunset and moonrise/moonset times, gamma radiation levels, and a Gregorian-Lunar calendar conversion table. It also includes experimental data from smart lampposts covering air temperature, humidity, and wind measurements.

The service is aimed at developers, researchers, and organizations needing programmatic access to Hong Kong's meteorological and related environmental data for integration into applications, analysis, or reporting.

Key features

• 9-day weather forecast and hourly current weather reports for Hong Kong
• Real-time and historical rainfall, temperature, humidity, and UV index data
• Weather warning, special weather tips, and tropical cyclone track information
• Earthquake and locally felt earth tremor reports
• Tidal information including predicted and latest tide heights
• Lightning count and radiation level data updated hourly or more frequently

Frequently asked questions