Santo António Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Santo António, São Tomé & Príncipe. The figures are based on a 30-year period (1990–2020) to provide a reliable average. Let's now guide you through the details for a complete overview.
Santo António has a notably wet climate with abundant precipitation, recording 1827 mm (72 in) of rainfall per year. It does, however, have a distinct rainy season during certain months. Have a look at our detailed charts below to see how precipitation varies throughout the year.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Santo António can be quite wet during October, receiving approximately 251 mm (9.9 in) of precipitation over 20 rainy days.
In contrast July, experiences much drier conditions, with 84 mm (3.3 in) of rainfall, spread across 10 rainy days.
October, the wettest month, has a maximum daytime temperature of 28°C (82°F). During the driest month July you can expect a temperature of 27°C (81°F). For more detailed insights into the city's temperatures, visit our Santo António Temperature page.
Annual Rainfall in São Tomé & Príncipe: City Comparison
The map below shows the annual precipitation across São Tomé & Príncipe. You can also select the different months in case you are interested in a specific month.
heavy rainfall
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Santo António vs World: Rainfall Compared
Santo António's average annual precipitation is 1827 mm (72 in). Let's compare this to some popular worldwide tourist destinations:
In Lisbon, Portugal, the average annual precipitation is 774 mm (30 in), characterized by wet winters and dry summers typical of the Mediterranean climate.
Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm (39 in) of annual rainfall, mostly in the summer.
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.
Climate change is affecting precipitation patterns worldwide, including Santo António:
- 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 Santo António's weather, including sunshine hours, humidity levels, and temperature data, visit our Santo António Climate page.
