Trincomalee weather in September 2025

Expect daytime maximum temperatures of 34°C in Trincomalee, Sri Lanka in September and very high heat and humidity based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 96 mm of rainfall in the month.

  • 34°C maximum daytime temperature in September in Trincomalee34
    34°C max day temperature
  • 7 hours of sunshine per day
  • 6 days with some rainfall in September in Trincomalee6
    6 days with some rainfall
  • 25°C minimum night-time temperature in September in Trincomalee25
    25°C min night temperature
  • 12 hours of daylight per day in September in Trincomalee12
    12 hours of daylight per day
  • Very high heat & humidity in September in TrincomaleeVH
    Very High heat & humidity
  • 96 mm monthly rainfall in September in Trincomalee96
    96 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Trincomalee11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in Trincomalee29
    29°C sea temperature

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The September weather guide for Sri Lanka (Trincomalee) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Sri Lanka

How hot is it in Trincomalee in September?

Daytime temperatures usually reach 34°C in Trincomalee in September with very high heat and humidity, falling to 25°C at night.

How sunny is it in Trincomalee in September?

There are normally 7 hours of bright sunshine each day in Trincomalee in September - that's 56% of daylight hours.

How warm is the sea around Trincomalee in September?

The average sea temperature around Trincomalee in September is 29°C.

Does it rain in Trincomalee in September?

There are usually 6 days with some rain in Trincomalee in September and the average monthly rainfall is 96mm.

Trincomalee September sunrise & sunset times

Browse the sunrise and sunset times for Trincomalee in September 2025. Select a month to view Trincomalee sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:57 18:13
Monday, 15th September 2025 05:55 18:05
Tuesday, 30th September 2025 05:53 17:57

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