Phnom Penh Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Phnom Penh. The numbers are calculated over a 30-year period to provide a reliable average. Let's now guide you through the details for a complete overview.

Phnom Penh is known for its substantial rainfall, with annual precipitation reaching 1415 mm.

Monthly Precipitation Levels

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

Phnom Penh can be quite wet during September, receiving approximately 252 mm of precipitation over 19 rainy days.

In contrast February, experiences much drier conditions, with 12 mm of rainfall, spread across 2 rainy days.

September, the city’s wettest month, has a maximum daytime temperature of 33°C. During the driest month February you can expect a temperature of 35°C. For more detailed insights into the city’s temperatures, visit our Phnom Penh Temperature page.

Annual Precipitation in Cambodia

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

Amsterdam Precipitation Compared World Wide

Phnom Penh’s average annual precipitation is 1415 mm. Let’s compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 644 mm, evenly distributed across the year with no extreme wet or dry seasons.

In Seoul, South Korea, the average annual precipitation is 1237 mm, with most rain falling during the summer monsoon season.

Melbourne, Australia, has 690 mm of rainfall annually, spread fairly evenly throughout the year.

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.

Global Warming and Precipitation

Climate change is affecting precipitation patterns worldwide, including Phnom Penh:

• 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.

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