Buenos Aires Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Buenos Aires, Bariloche and the Lake District, Argentina. The figures are based on a 30-year period (1990–2020) to provide a reliable average. Let's explore the details to provide you with a complete overview.

Buenos Aires has a relatively rainy climate with high precipitation levels, averaging 1000 mm (39 in) of rainfall annually.

Monthly Precipitation Levels

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

The amount of precipitation varies moderately throughout the year. The wettest month, October, sees around 111 mm (4.4 in) of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, July, still receives a respectable 61 mm (2.4 in) of rainfall.

October, the wettest month, has a maximum daytime temperature of 23°C (73°F). The city receives 226 hours of sunshine in this period. During the driest month July you can expect a temperature of 16°C (61°F). For more detailed insights into the city's temperatures, visit our Buenos Aires Temperature page.

Buenos Aires's average annual precipitation is 1000 mm (39 in). Let's compare this to some popular worldwide tourist destinations:

Chicago, USA, sees an annual precipitation of 1062 mm (42 in), with rain and snow contributing to its humid climate.

In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.

In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.

Ho Chi Minh City, Vietnam, receives 1955 mm (77 in) of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.

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.

• 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 Buenos Aires's weather, including sunshine hours, humidity levels, and temperature data, visit our Buenos Aires Climate page.