Hanoi Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Hanoi. 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.

Hanoi experiences significant rainfall throughout the year, averaging 1832 mm of precipitation annually.

Monthly Precipitation Levels

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

The seasons in Hanoi, bring significant changes in precipitation. The wettest month, August, receives heavy rainfall, with an average of 338 mm of precipitation.

This rainfall is distributed across 17 rainy days. In contrast, the driest month, December, experiences much less rainfall, totaling 37 mm over 5 rainy days. These distinct seasonal differences provide diverse experiences throughout the year.

August, the wettest month, has a maximum daytime temperature of 34°C. The city receives 173 hours of sunshine in this period. During the driest month December you can expect a temperature of 23°C. For more detailed insights into the city’s temperatures, visit our Hanoi Temperature page.

Annual Precipitation in Vietnam

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

Amsterdam Precipitation Compared World Wide

Hanoi’s average annual precipitation is 1832 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.

Osaka, Japan, experiences 1507 mm of rainfall annually, spread across the year with wetter summers.

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

Mumbai, India, experiences a tropical monsoon climate with 1860 mm of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.

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 Precipitation Patterns

Tropical Rainforests: In tropical regions, rainfall is generally abundant year-round. Areas near the equator, like the Amazon rainforest, can receive up to 3000 mm of rain annually.

Desert Regions: Deserts such as the Sahara and Arabian deserts typically see less than 250 mm of rainfall annually. Rainfall tends to be infrequent, but when it does occur, it is often intense.

Temperate Zones: In temperate regions, precipitation tends to be more evenly distributed, though areas closer to the ocean may see more rain in the winter months, and areas further inland experience drier summers.

Polar Regions: Precipitation in polar regions, like Antarctica, is extremely low, often falling as snow. Average annual precipitation in Antarctica is less than 200 mm, with some areas receiving as little as 50 mm annually.

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