Best time to go

Trincomalee in September 2026: weather, temperatures and activities

Do you want to visit Trincomalee in September 2026? Discover the usual weather at this time of year, average temperatures, the risk of rain, possible activities, and our opinion on whether September is a good month to travel to Trincomalee, Sri Lanka.

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Is it worth visiting Trincomalee in September?

Check your ideal travel criteria and see if the month of September suits your plans to go to Trincomalee.
What matters most?
Trincomalee in September 2026: weather, temperatures and activities

Page summary

Trincomalee in September in summary
Favourable weather
Min 28°C Max 33°C 122 mm 6 day(s) 67% 30% 30°C UV 7 12.0 h/day
Best activities in September
Beach and swimmingCultural visits and heritageAnimal observationDiving and snorkelingWatersportsNature and landscapesGastronomyWell-beingBoat trip and cruise
Practical guidelines
High crowding Moderate prices 05:55 18:05
Hourly weather

Average weather in Trincomalee in September 2026

Favourable weather

The weather in Trincomalee in September 2026 is based on statistical data from previous years in September. This allows you to forecast the weather in September 2026. Check the hourly statistics (6:00, 9:00, 12:00, 15:00, 18:00, 21:00, 0:00 and 3:00), with the associated average temperature, for the whole month, and also, by navigating the tabs, for the beginning, middle and end of the month.

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Climate

Climate of Trincomalee in September

Temperatures, precipitation and monthly trends help to better understand the climate in Trincomalee in September.

Temperatures and rain in Trincomalee in September

Average daily weather

Temperatures and rain day by day in September.
Minimal Average Maximums Average rainfall

Monthly temperatures

The month of September is highlighted to compare it quickly with the rest of the year.
Minimal Average Maximums

Monthly precipitation

The bar for the month under study is highlighted.
Average rainfall

About the climate in Trincomalee in September

Seasonal normals

Seasonal normals of Trincomalee in September

Check the seasonal normals in Trincomalee in September and compare the weather with the previous month and the following month (or the months of your choice by selecting months in the form below): temperatures, wind, rain, humidity, climate rating...

Last updated: 12/01/2026
Reference period for normals: January 2009 - December 2025
Month analyzed
September
Weather data August September October
Outside temperature
Average temperature 30.6°C 30.6°C 29.6°C
Maximum temperature 33.3°C 33.5°C 32.5°C
Minimum temperature 27.8°C 27.8°C 26.8°C
Record maximum temperature 39.0°C
(2013)
39.0°C
(2012)
38.0°C
(2012)
Record low temperature 23.0°C
(2009)
24.0°C
(2020)
22.0°C
(2019)
Number of days at +30° 30 day(s)
(97%)
29 day(s)
(97%)
28 day(s)
(90%)
Number of days at +18° 31 day(s)
(100%)
30 day(s)
(100%)
31 day(s)
(100%)
Number of days below 0° 0 day(s)
(0%)
0 day(s)
(0%)
0 day(s)
(0%)
Sea temperature
Sea temperature (average) 29.0°C 29.2°C 29.2°C
Sea temperature (minimum) 28.0°C 28.0°C 28.6°C
Sea temperature (maximum) 29.9°C 30.0°C 30.0°C
Wind
Wind speed 27 km/h 25 km/h 17 km/h
Wind temperature 27.8°C 27.8°C 26.8°C
Precipitation (rain)
Precipitation 84.8 mm 122.1 mm 304.1 mm
Number of days with precipitation 12 day(s)
(39%)
14 day(s)
(47%)
22 day(s)
(71%)
Number of days with significant precipitation (greater than 5 mm) 5 day(s)
(16%)
6 day(s)
(21%)
15 day(s)
(50%)
Record precipitation in one day 45.6 mm
(2021)
50.6 mm
(2014)
55.5 mm
(2014)
Other weather data
Humidity 67% 67% 76%
Visibility 9.7 km 9.6 km 8.9 km
Cloud cover 29% 30% 34%
UV index 7 7 7
Daily sunshine 12h 12h 11h
Sunrise and sunset
Sunrise time 05h58 05h55 05h53
Sunset time 18h21 18h05 17h49
Day length 12h23 12h10 11h56
Our opinion on the climate in September
The review of Where And When favourable weather favourable weather fair weather
Activities and events

What to do in Trincomalee in September?

Best activities in September
Beach and swimmingCultural visits and heritageAnimal observationDiving and snorkelingWatersportsNature and landscapesGastronomyWell-beingBoat trip and cruise
Observed weather

What was the weather like in Trincomalee in September last?

Find the observed weather calendar in Trincomalee in September 2025, with each day’s weather, temperatures and precipitation.

Mon. Tue. Wed. Thu. Fri. Sat. Sun.
1
Partly Cloudy
25°C32°C0.0 mm
2
Partly Cloudy
24°C34°C0.0 mm
3
Partly Cloudy
24°C34°C0.0 mm
4
Partly Cloudy
24°C34°C0.0 mm
5
Partly Cloudy
25°C34°C0.0 mm
6
Cloudy
25°C35°C0.0 mm
7
Patchy rain nearby
25°C35°C8.6 mm
8
Patchy light drizzle
23°C30°C10.3 mm
9
Partly Cloudy
24°C35°C8.1 mm
10
Partly Cloudy
24°C31°C0.0 mm
11
Partly Cloudy
24°C30°C0.0 mm
12
Partly Cloudy
24°C33°C0.0 mm
13
Partly Cloudy
25°C33°C0.0 mm
14
Partly Cloudy
25°C33°C0.0 mm
15
Overcast
24°C32°C0.0 mm
16
Partly Cloudy
25°C32°C0.0 mm
17
Cloudy
25°C33°C0.0 mm
18
Partly Cloudy
25°C34°C0.0 mm
19
Patchy rain nearby
25°C33°C0.0 mm
20
Partly Cloudy
24°C34°C0.0 mm
21
Partly Cloudy
25°C34°C0.0 mm
22
Partly Cloudy
25°C32°C0.0 mm
23
Partly Cloudy
25°C33°C0.0 mm
24
Partly Cloudy
25°C32°C0.0 mm
25
Light rain shower
25°C30°C0.5 mm
26
Patchy rain nearby
24°C27°C0.0 mm
27
Clear/Sunny
25°C33°C0.0 mm
28
Clear/Sunny
25°C33°C0.0 mm
29
Partly Cloudy
25°C32°C0.0 mm
30
Partly Cloudy
25°C33°C0.0 mm
Nearby

Where to go near Trincomalee in September?

Compare cities and destinations near Trincomalee in September to find another travel stop, a nearby alternative or a logical continuation of your stay in Trincomalee.

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Every month

Best time to visit Trincomalee month by month

Compare the weather in Trincomalee across all months of the year and open each detailed page to find the best time.

Frequently asked questions

Travel to to Trincomalee in September: your frequently asked questions

Short answers to the questions we ask ourselves before booking for this month.

Yes, it’s a good time. Conditions are favorable in Trincomalee in September, which places this month 8th out of 12.

Expect an average of 33°C during the day and 28°C at night, with about 122 mm of precipitation spread over 6 rainy days.

Yes: the sea is 29°C on average in September, a pleasant temperature for swimming.

Expect about 12.0 hours of sunshine per day on average for this month.

This month is particularly suited to these activities: Beach and swimming, Cultural visits and heritage, Animal observation and Diving and snorkeling. These are the ones for which the conditions on site are most favourable.

Visitor numbers are moderate: this month is in High crowding, with an index of 60/100. It is often a good compromise between weather and tranquility.

Prices are average: level Moderate prices, with an index of 49/100, including flights and accommodation.

The most favorable months in Trincomalee are: January, February, March, May, June, July, August, September and December. You are therefore already in one of the best times of the year; shifting your plans would not gain you much in terms of weather.
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