Hanoi Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Hanoi, Ha Noi Municipality, Vietnam. This average is based on long-term data collected between 1990 and 2020. Let's now guide you through the details for a complete overview.
Hanoi has a relatively rainy climate with high precipitation levels, averaging 1832 mm (72 in) of rainfall annually. Despite the high annual total, it does experience a distinct rainy season during certain months. Examine our detailed charts below to understand these seasonal patterns.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
The seasons in Hanoi, bring significant changes in precipitation. The wettest month, August, receives heavy rainfall, with an average of 338 mm (13 in) of precipitation. This rainfall is distributed across 17 rainy days.
In contrast, the driest month, December, experiences much less rainfall, totaling 37 mm (1.5 in) 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 (93°F). The city receives 173 hours of sunshine in this period. During the driest month December you can expect a temperature of 23°C (73°F). For more detailed insights into the city's temperatures, visit our Hanoi Temperature page.
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Explore Hanoi's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Hanoi spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Vietnam: City Comparison
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.
heavy rainfall
high
moderate
low
almost none
Hanoi vs World: Rainfall Compared
Hanoi's average annual precipitation is 1832 mm (72 in). Let's compare this to some popular worldwide tourist destinations:
Athens, Greece, receives an average annual precipitation of 400 mm (16 in), making it one of the drier Mediterranean climates with rainfall mostly in winter.
In Seoul, South Korea, the average annual precipitation is 1237 mm (49 in), with most rain falling during the summer monsoon season.
Perth, Australia, receives 565 mm (22 in) of rainfall annually, mostly during the winter months.
Singapore, situated near the equator, gets 2581 mm (102 in) of rainfall annually, with no distinct dry season and consistent monthly precipitation.
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.
Precipitation has a very strong role in determining the local climate and ecosystem:
- 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.
- Mawsynram in India is noted as being the wettest place on earth, with over 11 meters (36 feet) of rain falling every year.
- In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm (0.004 inches) per year, with some years recording virtually no rainfall.
- Nearly 1,650 thunderstorm cells are estimated over the planet at any given time.
For more detailed information about Hanoi's weather, including sunshine hours, humidity levels, and temperature data, visit our Hanoi Climate page.
