Trincomalee in Summer
In summer (June, July and August), Trincomalee sees average daytime highs around 33°C and overnight lows near 27°C, with 93 mm of rain over about 17 wet days across the season. It is the warmest season of the year and the driest season of the year.
Across summer, daytime highs hold fairly steady around 33°C. The sky is clear or mostly clear about 9% of the time across summer, and the air most often feels oppressive.
Summer is Trincomalee's weakest season of the year to visit on our travel score. Trincomalee has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Trincomalee's year-round climate.
- Avg daytime high
- 33°C
- warmest season of the year
- Avg overnight low
- 27°C
- Rainfall
- 93 mm
- 17 wet days
- Avg wind
- 22 km/h
- Travel score
- 3.6
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Trincomalee in Summer
Across summer, daytime highs hold fairly steady around 33°C.
A typical summer day in Trincomalee reaches about 33°C and drops to 27°C overnight. The warmest of the three months is June, the coolest August.
How summer really feels in Trincomalee
Once humidity and wind are folded in, summer brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Trincomalee weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 25° | 126 | 14.5 | 11.6 | 5.8 |
| Feb | 28° / 25° | 73 | 9.7 | 11.7 | 6.3 |
| Mar | 29° / 25° | 40 | 7.2 | 11.9 | 5.8 |
| Apr | 31° / 26° | 56 | 10 | 12.2 | 4.4 |
| May | 33° / 27° | 48 | 8.2 | 12.4 | 3.6 |
| Jun | 33° / 27° | 18 | 3.2 | 12.5 | 3.6 |
| Jul | 33° / 27° | 31 | 5.5 | 12.4 | 3.6 |
| Aug | 33° / 27° | 45 | 7.8 | 12.3 | 3.6 |
| Sep | 33° / 26° | 65 | 10.7 | 12.1 | 3.5 |
| Oct | 31° / 26° | 186 | 18.5 | 11.8 | 3.6 |
| Nov | 28° / 25° | 300 | 24.1 | 11.6 | 3.9 |
| Dec | 27° / 25° | 277 | 20.9 | 11.5 | 4.7 |
Cloud cover in Summer
The sky is clear or mostly clear about 9% of the time across summer.
Chance of precipitation in Summer
Trincomalee gets around 93 mm of rain over 17 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 22 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 30 min in early June to 12 h 12 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.9 kWh/m².
Hazard calendar for Trincomalee
In summer, Trincomalee overlaps its cyclone season. The full year is below, with each hazard's peak months called out.
Trincomalee sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.
Trincomalee's monsoon runs October–December, when most of the year's rain falls.
Is summer a good time to visit Trincomalee?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Trincomalee. The water and warmth also suit a beach or pool day.
What to pack for Trincomalee in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Trincomalee sees daytime highs around 33°C and nights near 27°C. Pack light clothes. Worth having: sun protection and a windbreaker. About 17 days see rain.
Sea temperature near Trincomalee in Summer
The nearest coast averages about 29°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 17 km away) is warmest in May at about 30°C and coldest in January near 27°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 27 | 28 | 29 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 28 |
| Comfort | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 28 | Warm |
| Mar | 29 | Tropical |
| Apr | 30 | Tropical |
| May | 30 | Tropical |
| Jun | 30 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Warm |
UV index in Trincomalee in Summer
Clear-sky midday UV across summer averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Trincomalee peaks around May 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 9 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 10 | 12 | 13 | 13 | 14 | 11 | 11 | 13 | 12 | 13 | 11 | 9 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 12 | Extreme |
| Mar | 13 | Extreme |
| Apr | 13 | Extreme |
| May | 14 | Extreme |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 13 | Extreme |
| Sep | 12 | Extreme |
| Oct | 13 | Extreme |
| Nov | 11 | Extreme |
| Dec | 9 | Very high |
Air quality in Trincomalee in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Trincomalee is worst in May — around 28 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 22 | 21 | 24 | 27 | 28 | 21 | 20 | 20 | 21 | 25 | 24 | 22 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 22 | Moderate |
| Feb | 21 | Moderate |
| Mar | 24 | Moderate |
| Apr | 27 | Moderate |
| May | 28 | Moderate |
| Jun | 21 | Moderate |
| Jul | 20 | Moderate |
| Aug | 20 | Moderate |
| Sep | 21 | Moderate |
| Oct | 25 | Moderate |
| Nov | 24 | Moderate |
| Dec | 22 | Moderate |
Where is Trincomalee?
Trincomalee sits at 8.6°N, 81.2°E, 10 m above sea level, in Sri Lanka. The nearest listed city is Vakarai, 54 km away.
Topography around Trincomalee
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Trincomalee.
Within 3 km, the terrain around Trincomalee has only modest variations in elevation — a maximum elevation change of 78 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 161 m; within 80 km, large variations in elevation — a maximum elevation change of 684 m.
The land around Trincomalee is covered by water (62%) within 3 km, water (55%) and trees (24%) within 16 km, and trees (41%) and water (38%) within 80 km.
Sri Lanka travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type D / G / M
- 230 V · 50 Hz
- Prices
- ≈ 27% of US
- price level, 2025
- GDP per capita
- $5,002
- 2025
- Happiness
- 4.0 / 10
- World Happiness, 2025
- Safe drinking water
- 47%
- of population, 2024
- Homicide rate
- 3.3
- per 100k, 2019
- Road deaths
- 19.7
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 486
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Trincomalee (8.5778°, 81.2289°, elevation 10 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.