São Luís Rainfall & Precipitation: Monthly Averages and Year-Round Insights

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

São Luís has a notably wet climate with abundant precipitation, recording 2171 mm of rainfall per year.

Monthly Precipitation Levels

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

The climate in São Luís shows significant variation throughout the year. Expect 434 mm of precipitation during the wettest month March, distributed over 31 rainy days.

In contrast, September offers drier and sunnier days, with around 18 mm of rainfall over 6 rainy days.

March, the city’s wettest month, has a maximum daytime temperature of 29°C. During the driest month September you can expect a temperature of 31°C. For more detailed insights into the city’s temperatures, visit our São Luís Temperature page.

Annual Precipitation in Brazil

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

Amsterdam Precipitation Compared World Wide

São Luís’s average annual precipitation is 2171 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.

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm of annual rainfall, mostly in the summer.

Adelaide, Australia, enjoys 511 mm of annual precipitation, with dry summers and wet winters.

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.

Interesting weather facts

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