Nilaveli Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Nilaveli, Trincomalee District, Sri Lanka. The figures are based on a 30-year period (1990–2020) to provide a reliable average. Let's explore the details to provide you with a complete overview.
Nilaveli experiences significant rainfall throughout the year, averaging 1313 mm (52 in) of precipitation annually. However, this abundant rainfall is not evenly distributed, with a distinct dry and 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))
Nilaveli can be quite wet during November, receiving approximately 314 mm (12 in) of precipitation over 16 rainy days.
In contrast June, experiences much drier conditions, with 22 mm (0.9 in) of rainfall, spread across 2 rainy days.
November, the wettest month, has a maximum daytime temperature of 30°C (86°F). The city receives 168 hours of sunshine in this period. During the driest month June you can expect a temperature of 34°C (93°F). For more detailed insights into the city's temperatures, visit our Nilaveli Temperature page.
Daily Historical Precipitation
32-year average (1985-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in July
Explore Nilaveli's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Nilaveli spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Sri Lanka: City Comparison
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.
heavy rainfall
high
moderate
low
almost none
Nilaveli vs World: Rainfall Compared
Nilaveli's average annual precipitation is 1313 mm (52 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.
In Seoul, South Korea, the average annual precipitation is 1237 mm (49 in), with most rain falling during the summer monsoon season.
In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.
Ho Chi Minh City, Vietnam, receives 1955 mm (77 in) of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.
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.
- The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
- Approximately 70% of lightning bolts strike land rather than oceans.
- A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.
For more detailed information about Nilaveli's weather, including sunshine hours, humidity levels, and temperature data, visit our Nilaveli Climate page.
