Hong Kong Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Hong Kong, Hong Kong. This average is based on long-term data collected between 1990 and 2020. Now, let's explore all the details to give you a full picture.

Hong Kong has a notably wet climate with abundant precipitation, recording 1791 mm (71 in) of rainfall per year. It does, however, have a distinct dry and rainy season during certain months. Have a look at our detailed charts below to see how precipitation varies throughout the year.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

Hong Kong can be quite wet during June, receiving approximately 330 mm (13 in) of precipitation over 19 rainy days.

In contrast January, experiences much drier conditions, with 32 mm (1.3 in) of rainfall, spread across 6 rainy days.

June, the wettest month, has a maximum daytime temperature of 31°C (88°F). The city receives 144 hours of sunshine in this period. During the driest month January you can expect a temperature of 20°C (68°F). For more detailed insights into the city's temperatures, visit our Hong Kong Temperature page.

Hong Kong's average annual precipitation is 1791 mm (71 in). Let's compare this to some popular worldwide tourist destinations:

The climate in San Francisco, USA, is influenced by coastal weather, with 469 mm (18 in) of rainfall mostly during the winter months.

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm (39 in) of annual rainfall, mostly in the summer.

Adelaide, Australia, enjoys 511 mm (20 in) of annual precipitation, with dry summers and wet winters.

Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm (66 in) of annual rainfall, with the heaviest precipitation occurring during September and October.

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

Climate change is affecting precipitation patterns worldwide, including Hong Kong:

• Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
• Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

For more detailed information about Hong Kong's weather, including sunshine hours, humidity levels, and temperature data, visit our Hong Kong Climate page.