Gustavia Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Gustavia, Saint Barthélemy. 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.

Generally, Gustavia receives mid-range precipitation levels, with 904 mm (36 in) annually. The distribution varies significantly throughout the year, with a distinct dry season during certain months, as shown in our charts below.

Monthly Precipitation Levels

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

The climate in Gustavia shows significant variation throughout the year. Expect 138 mm (5.4 in) of precipitation during the wettest month October, distributed over 20 rainy days.

In contrast, March offers drier and sunnier days, with around 30 mm (1.2 in) of rainfall over 13 rainy days.

October, the wettest month, has a maximum daytime temperature of 29°C (84°F). The city receives 251 hours of sunshine in this period. During the driest month March you can expect a temperature of 27°C (81°F). For more detailed insights into the city's temperatures, visit our Gustavia Temperature page.

Gustavia's average annual precipitation is 904 mm (36 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.

In Tokyo, Japan, the average annual precipitation is 1528 mm (60 in), with significant summer rains due to typhoon season.

Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm (66 in) of annual rainfall, with the heaviest precipitation occurring during September and October.

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 Gustavia:

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