Saint John Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Saint John, Saint John, US Virgin Islands. 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.

Generally, Saint John experiences moderate precipitation patterns, averaging 994 mm (39 in) yearly. However, this average masks significant seasonal variation, including a distinct dry season during certain months that are clearly visible in our monthly breakdown below.

Monthly Precipitation Levels

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

The climate in Saint John shows significant variation throughout the year. Expect 145 mm (5.7 in) of precipitation during the wettest month September, distributed over 19 rainy days.

In contrast, March offers drier and sunnier days, with around 33 mm (1.3 in) of rainfall over 14 rainy days.

September, the wettest month, has a maximum daytime temperature of 30°C (86°F). 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 Saint John Temperature page.

Saint John's average annual precipitation is 994 mm (39 in). Let's compare this to some popular worldwide tourist destinations:

New York City, USA, receives 1276 mm (50 in) of rainfall annually, with precipitation evenly distributed throughout the year.

Beijing, China, receives 560 mm (22 in) of annual precipitation, concentrated in the summer months.

In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.

Kuala Lumpur, Malaysia, receives 2529 mm (100 in) of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.

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.

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