Bollegala Rainfall & Precipitation: Monthly Averages and Year-Round Insights
This page shows the average amount of rainfall per month in Bollegala. 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.
Bollegala has a relatively rainy climate with high precipitation levels, averaging 2654 mm of rainfall annually.
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 362 mm of precipitation, recorded across 16 rainy days.
In contrast, the drier season, January brings less rainfall, with 72 mm over 5 rainy days.October, the wettest month, has a maximum daytime temperature of 31°C. The city receives 202 hours of sunshine in this period. During the driest month January you can expect a temperature of 32°C. For more detailed insights into the city’s temperatures, visit our Bollegala 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
Bollegala’s average annual precipitation is 2654 mm. Let’s compare this to some popular worldwide tourist destinations:
Boston, USA, experiences 1238 mm of annual precipitation, including significant snowfall during the winter.
Osaka, Japan, experiences 1507 mm of rainfall annually, spread across the year with wetter summers.
Perth, Australia, receives 565 mm of rainfall annually, mostly during the winter months.
Kuala Lumpur, Malaysia, receives 2529 mm of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.
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 Bollegala’s weather, including sunshine hours, humidity levels, and temperature data, visit our Bollegala Climate page.