Saint Lucia Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Saint Lucia. The numbers are calculated over a 30-year period to provide a reliable average. Now, let’s explore all the details to give you a full picture.

On average, Saint Lucia receives a reasonable amount of rainfall, with an annual precipitation of 969 mm.

Monthly Precipitation Levels

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

Significant seasonal changes in precipitation occur throughout the year. During the wet season, October receives substantial rainfall, averaging 137 mm of precipitation, recorded across 18 rainy days.

In contrast, the drier season, February brings less rainfall, with 36 mm over 13 rainy days.

October, the wettest month, has a maximum daytime temperature of 31°C. The city receives 214 hours of sunshine in this period. During the driest month February you can expect a temperature of 29°C. For more detailed insights into the city’s temperatures, visit our Saint Lucia Temperature page.

Annual Precipitation in Saint Lucia

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

Amsterdam Precipitation Compared World Wide

Saint Lucia’s average annual precipitation is 969 mm. Let’s compare this to some popular worldwide tourist destinations:

The city of Rome, Italy, has an average annual precipitation of 832 mm, spread fairly evenly throughout the year.

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

Melbourne, Australia, has 690 mm of rainfall annually, spread fairly evenly throughout the year.

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

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

• Mawsynram in India is noted as being the wettest place on earth, with over 11 meters of rain falling every year.
• In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm 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 Saint Lucia’s weather, including sunshine hours, humidity levels, and temperature data, visit our Saint Lucia Climate page.