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Sri Lanka weather in September 2025
Expect daytime maximum temperatures of 30°C in Sri Lanka in September and high heat and humidity based on long-term weather averages. There are 6 hours of sunshine per day on average with 14 days with some rainfall and typically 236 mm of rainfall in the month.
- 30°C max day temperature
30 - 6 hours of sunshine per day
- 14 days with some rainfall
14 - 25°C min night temperature
25 - 12 hours of daylight per day
12 - High heat & humidity
H - 236 mm of monthly rainfall
236 - 11+ (Extreme) UV index
11 - 28°C sea temperature
28
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The September weather guide for Sri Lanka (Colombo) 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.
Top Sri Lanka destinations
Below are average maximum temperatures at popular countries, regions and places in Sri Lanka in September. Select a holiday destination to see more weather parameters.
All Sri Lanka destinations
- Ahungalla
- Anuradhapura
- Arugam Bay
- Aturuwella
- Bentota
- Beruwela
- Colombo
- Galle
- Hikkaduwa
- Jaffna
- Kalutara
- Kandalama
- Kandy
- Kurunegala
- Matara
- Mirissa Beach
- Mount Lavinia-Dehiwala
- Negombo
- Nuwara Eliya
- Polonnaruwa
- Sigiriya
- Trincomalee
- Unawatuna
- Wadduwa
- Waikkal
- Yala
Metric (°C / mm) | Imperial (°F / inches)
More about Sri Lanka
How hot is it in Sri Lanka in September?
Daytime temperatures usually reach 30°C in Colombo, Sri Lanka in September with high heat and humidity, falling to 25°C at night.
How sunny is it in Sri Lanka in September?
There are normally 6 hours of bright sunshine each day in Colombo, Sri Lanka in September - that's 50% of daylight hours.
How warm is the sea around Sri Lanka in September?
The average sea temperature around Colombo, Sri Lanka in September is 28°C.
Does it rain in Sri Lanka in September?
There are usually 14 days with some rain in Colombo, Sri Lanka in September and the average monthly rainfall is 236mm.
Sri Lanka September sunrise & sunset times
Browse the sunrise and sunset times for Sri Lanka in September 2025. Select a month to view Sri Lanka sunrise and sunset times for the next 12 months. The Sri Lanka sunrise and sunset times shown below are for Colombo.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Monday, 1st September 2025 | 06:03 | 18:18 |
| Monday, 15th September 2025 | 06:01 | 18:10 |
| Tuesday, 30th September 2025 | 05:59 | 18:02 |
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