Hong Kong Obervatory

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Provide weather information, earthquake information, and climate data.

Hong Kong Obervatory's website screenshot

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

What kind of data does this open data service provide?

It provides meteorological, tidal, astronomical, and seismic datasets covering Hong Kong, including rainfall, temperature, UV index, weather warnings, tropical cyclone tracks, and earthquake reports.

How often is the data updated?

Update frequency varies by dataset, ranging from every 5-15 minutes for real-time observations to hourly, daily, monthly, or yearly for other datasets.

Who is this data intended for?

It is intended for developers and users who need access to Hong Kong weather, climate, tidal, and earthquake data for applications or analysis.

Does it include historical or forecast data?

Yes, it includes both forecast data such as the 9-day weather forecast and historical/climatological data such as daily mean temperatures and tropical cyclone best track data.