Trincomalee Weather in December
December in Trincomalee sees daytime temperatures around 29°C (84°F) and lows of 25°C (77°F) at night. Being part of the rainy season, heavy rainfall is a regular part of the day, so pack accordingly.
Rainfall in Trincomalee in December
As part of the rainy season, Trincomalee sees around 16 days of rain in December, with an average of 283 mm (11 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.
Temperature in Trincomalee in December
Expect highs of 29°C (84°F) in Trincomalee in December, with nights dropping to around 25°C (77°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in Trincomalee in December
The area experiences a moderate amount of sunshine, with approximately 171 hours of sunlight expected. Even though this month is part of the rainy season, you could still see the sun every now and then.
Wind Speed in Trincomalee in December
Wind speeds average 4 m/s (8 knots) during December. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.
Average water temperature in December
The water is 27°C (81°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.December in Trincomalee has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sri Lanka, check out our Trincomalee's climate page.
Trincomalee Temperature in December
Min Temperature
25°C (77°F)
Max Temperature
29°C (84°F)
Water Temperature
27°C (81°F)
Chance of Rain
52%
Precipitation
283 mm (11 in)
Rainy days
16 days
Humidity
80%
Windspeed
4 m/s (8 knots)
Sunshine
171 hours
Percentage Sunshine
Daily Historical Temperatures
41-year average (1976-2025)
Based on our historical records, temperatures in Trincomalee typically stay consistent throughout December, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in December
Daily Historical Precipitation
41-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Trincomalee in December
Browse day-by-day weather records for Trincomalee spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Trincomalee historical weather extremes in December
Our historical data for Trincomalee spans 2005 to 2025, revealing these weather extremes.
- The hottest December day on record in Trincomalee reached 33°C (91°F) (December 12, 2016).
- Trincomalee experienced its chilliest December day on December 1, 2016, reaching only 24°C (75°F).
- Nighttime temperatures dropped to 17°C (63°F) on December 8, 2022, marking the coldest December night on record.
Best Places in Sri Lanka in December
Find out more about the weather in Sri Lanka and which places have the best travel conditions in this month. See all of Sri Lanka in December →
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What to Wear in Trincomalee in December
Warm but pleasant conditions in Trincomalee in December. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. With water temperatures around 27°C (81°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Trincomalee in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sri Lanka, check out our Trincomalee's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Trincomalee climate overview or explore weather in Sri Lanka.
