Unawatuna Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Unawatuna. The numbers are calculated over a 30-year period to provide a reliable average. Let's now guide you through the details for a complete overview.

Unawatuna is known for its substantial rainfall, with annual precipitation reaching 2372 mm.

Monthly Precipitation Levels

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

Unawatuna can be quite wet during May, receiving approximately 294 mm of precipitation over 12 rainy days.

In contrast February, experiences much drier conditions, with 68 mm of rainfall, spread across 5 rainy days.

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

Annual Precipitation in Sri Lanka

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

Amsterdam Precipitation Compared World Wide

Unawatuna’s average annual precipitation is 2372 mm. Let’s compare this to some popular worldwide tourist destinations:

The climate in San Francisco, USA, is influenced by coastal weather, with 469 mm of rainfall mostly during the winter months.

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

Perth, Australia, receives 565 mm of rainfall annually, mostly during the winter months.

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

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

• "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
• The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm wide and 20 cm thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
• The greatest snowfall recorded was on Mt. Rainier, Washington State, USA—over 31.5 meters fell during the winter of 1972.

For more detailed information about Unawatuna’s weather, including sunshine hours, humidity levels, and temperature data, visit our Unawatuna Climate page.