Unawatuna Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Unawatuna, Galle District, Sri Lanka. Long-term data from 1990 to 2020 was used to calculate these averages. Let's explore the details to provide you with a complete overview.

Unawatuna experiences significant rainfall throughout the year, averaging 2372 mm (93 in) of precipitation annually. However, this abundant rainfall is not evenly distributed, with a distinct rainy season during certain months. You can clearly see this in our monthly precipitation graphs below.

Monthly Precipitation Levels

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

Significant seasonal changes in precipitation occur throughout the year. During the wettest month, May receives substantial rainfall, averaging 294 mm (12 in) of precipitation, recorded across 12 rainy days.

In contrast, the driest month, February brings less rainfall, with 68 mm (2.7 in) over 5 rainy days.

May, the wettest month, has a maximum daytime temperature of 30°C (86°F). The city receives 200 hours of sunshine in this period. During the driest month February you can expect a temperature of 30°C (86°F). For more detailed insights into the city's temperatures, visit our Unawatuna Temperature page.

Unawatuna's average annual precipitation is 2372 mm (93 in). Let's compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 644 mm (25 in), evenly distributed across the year with no extreme wet or dry seasons.

In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.

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

Mumbai, India, experiences a tropical monsoon climate with 1860 mm (73 in) of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.

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