Climate averages 1991–2020
Trincomalee weather
by month.
See how the year changes. June has the highest average daily maximum; June has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Trincomalee averages a daytime high of 30.8°C and a nighttime low of 25.4°C, with about 1,263 mm of rain on roughly 140 days. June is the warmest month (average high 33.8°C) and January the coolest (26.9°C). November is the wettest month with 301 mm; June is the driest with 18 mm.
The annual picture
A year in Trincomalee
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Trincomalee climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.9°C24.1°C | 24.1°C | 126 | 14.5 | 11.712 h |
| February | 27.9°C24.4°C | 24.4°C | 74 | 9.6 | 11.812 h |
| March | 30.0°C25.1°C | 25.1°C | 40 | 7.1 | 12.112 h |
| April | 31.7°C26.2°C | 26.2°C | 56 | 10.1 | 12.312 h |
| May | 33.5°C26.7°C | 26.7°C | 48 | 8.1 | 12.513 h |
| June | 33.8°C26.6°C | 26.6°C | 18 | 3.1 | 12.613 h |
| July | 33.6°C26.3°C | 26.3°C | 31 | 5.5 | 12.613 h |
| August | 33.3°C26.0°C | 26.0°C | 45 | 7.8 | 12.412 h |
| September | 33.0°C25.8°C | 25.8°C | 65 | 10.7 | 12.212 h |
| October | 30.7°C25.2°C | 25.2°C | 186 | 18.6 | 11.912 h |
| November | 28.1°C24.5°C | 24.5°C | 301 | 24.1 | 11.712 h |
| December | 27.1°C24.3°C | 24.3°C | 276 | 20.9 | 11.612 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- BatticaloaSri Lanka · 109 kmHigh 31.2°C · Low 24.9°C · 1,286 mm rain a year
- KalmunaiSri Lanka · 146 kmHigh 30.4°C · Low 25.3°C · 1,397 mm rain a year
- KandySri Lanka · 157 kmHigh 27.2°C · Low 20.7°C · 1,692 mm rain a year
- Point PedroSri Lanka · 176 kmHigh 29.8°C · Low 26.1°C · 945 mm rain a year
- JaffnaSri Lanka · 181 kmHigh 29.4°C · Low 26.3°C · 1,106 mm rain a year
- NegomboSri Lanka · 216 kmHigh 29.6°C · Low 24.6°C · 2,073 mm rain a year
- ColomboSri Lanka · 238 kmHigh 29.6°C · Low 24.2°C · 2,243 mm rain a year
- Dehiwala-Mount LaviniaSri Lanka · 244 kmHigh 29.2°C · Low 24.3°C · 2,370 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+5:30, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 8.60°, 81.20° (4 km from the city centre). Rain comes from the 0.25° cell at 8.50°, 81.25°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.