San José Rainfall & Precipitation: Monthly Averages and Year-Round Insights

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

San José is known for its substantial rainfall, with annual precipitation reaching 1388 mm.

Monthly Precipitation Levels

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

The climate in San José shows significant variation throughout the year. Expect 252 mm of precipitation during the wettest month September, distributed over 17 rainy days.

In contrast, February offers drier and sunnier days, with around 24 mm of rainfall over 8 rainy days.

September, the wettest month, has a maximum daytime temperature of 33°C. During the driest month February you can expect a temperature of 32°C. For more detailed insights into the city’s temperatures, visit our San José Temperature page.

Annual Precipitation in Guatemala

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

Amsterdam Precipitation Compared World Wide

San José’s average annual precipitation is 1388 mm. Let’s compare this to some popular worldwide tourist destinations:

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

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

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

Kuala Lumpur, Malaysia, receives 2529 mm of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.

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 San José:

• 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 San José’s weather, including sunshine hours, humidity levels, and temperature data, visit our San José Climate page.