Hong Kong Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Hong Kong. The numbers are calculated over a 30-year period to provide a reliable average. Now, let’s break down all the details for a clearer picture.

Hong Kong has a relatively rainy climate with high precipitation levels, averaging 1791 mm of rainfall annually.

Monthly Precipitation Levels

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

Significant seasonal changes in precipitation occur throughout the year. During the wet season, June receives substantial rainfall, averaging 330 mm of precipitation, recorded across 19 rainy days.

In contrast, the drier season, January brings less rainfall, with 32 mm over 6 rainy days.

June, the city’s wettest month, has a maximum daytime temperature of 31°C and receives 144 hours of sunshine. During the driest month January you can expect a temperature of 20°C. For more detailed insights into the city’s temperatures, visit our Hong Kong Temperature page.

Annual Precipitation in Hong Kong

The map below shows the annual precipitation across Hong Kong. You can also select the different months in case you are interested in a specific month.

Amsterdam Precipitation Compared World Wide

Hong Kong’s average annual precipitation is 1791 mm. Let’s compare this to some popular worldwide tourist destinations:

Boston, USA, experiences 1238 mm of annual precipitation, including significant snowfall during the winter.

In Shanghai, China, the annual average precipitation is 1347 mm, with a humid subtropical climate.

In Tokyo, Japan, the average annual precipitation is 1528 mm, with significant summer rains due to typhoon season.

Ho Chi Minh City, Vietnam, receives 1955 mm of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.

How is Precipitation Measured?

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.

Sea vs. Land Precipitation

The proximity of a location to a large body of water can significantly affect its rainfall patterns:

• Ocean Influence: Coastal regions typically receive more rainfall due to the presence of moisture-laden winds from the ocean. These regions tend to have more humid climates and experience more frequent precipitation, especially in winter.
• Continental Climates: Areas further from the sea, such as inland or continental regions, experience less frequent rainfall and more extreme seasonal variations in precipitation.

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