Climate averages 1991–2020
Trincomalee weather
in September.
A hot, moderately wet month: the 5th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Trincomalee: daytime highs average 33.0°C and nights cool to about 25.8°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 65 mm of rain on roughly 11 days, which makes September a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 11 min on an average September day.
The nearest other city in this atlas is Batticaloa (109 km away). In September its highs average 33.2°C, about as warm as Trincomalee, with 48 mm of rain.
Among the 12 cities listed in Sri Lanka, Trincomalee ranks 2nd of 12 for the warmest September highs and 3rd of 12 for the driest September (rainfall, lowest first). The mean September high of those 12 cities is 29.9°C; Trincomalee is 3.1°C warmer than that mean.
From September to October, average highs fall by 2.3°C to 30.7°C, and monthly rainfall rises from 65 mm to 186 mm.
The annual picture
September in context
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, selected | 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
September in nearby cities
- Batticaloa in SeptemberSri Lanka · 109 kmHigh 33.2°C · Low 25.6°C · 48 mm rain
- Kalmunai in SeptemberSri Lanka · 146 kmHigh 32.0°C · Low 25.9°C · 67 mm rain
- Kandy in SeptemberSri Lanka · 157 kmHigh 27.1°C · Low 21.0°C · 121 mm rain
- Point Pedro in SeptemberSri Lanka · 176 kmHigh 30.8°C · Low 26.7°C · 42 mm rain
- Jaffna in SeptemberSri Lanka · 181 kmHigh 30.1°C · Low 26.9°C · 67 mm rain
- Negombo in SeptemberSri Lanka · 216 kmHigh 28.6°C · Low 24.9°C · 215 mm rain
- Colombo in SeptemberSri Lanka · 238 kmHigh 28.5°C · Low 24.5°C · 223 mm rain
- Dehiwala-Mount Lavinia in SeptemberSri Lanka · 244 kmHigh 28.2°C · Low 24.5°C · 232 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Trincomalee) is explained once on the Trincomalee year overview and on the Sources, method and limits page.