Sri Lanka weather

Our guide to the weather in Sri Lanka during September

29

Average high

6

UV Index

454mm

Monthly rainfall

28

Sea temperature

Sri Lanka is a beautiful and diverse destination with a rich cultural heritage, offering something for everyone. September is a great time to visit, with the weather being warm and pleasant. We've looked at the most up-to-date weather data for Sri Lanka, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Sri Lanka weather in September.

How warm is it in Sri Lanka during September?

The temperature is extremely stable in September with average highs of 29℃ and lows just 4℃ lower at 25℃. Of course, the high humidity will make it feel even hotter. The UV index will be high at this time of year, so protection against skin and eye damage is needed. Try to limit exposure between 10am and 4pm. Apply broad spectrum SPF 30+ sunscreen every few hours, even if it's cloudy, or more frequently after sweating or swimming, and wear UV-blocking sunglasses too, and bear in mind that bright surfaces, such as sand and water increase UV exposure.

Does it rain in Sri Lanka during September?

On average, there will be 14 rainy days during the month, amounting to 454.4mm in total. That's a lot of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. There's a good chance that you'll catch a thunderstorm during your trip.

Is it windy in Sri Lanka during September?

You're unlikely to experience any strong winds. Expect a gentle breeze that increases to moderate at times during September. The high humidity and warm temperature will make the breeze feel warm, so any cooling effect will be limted.

How warm is the sea in Sri Lanka during September?

The water around Sri Lanka reaches a very pleasant 28℃ during September. This is very warm, and will feel bath-like. People who normally feel the cold will find this temperature perfectly acceptable. The hot air temperature and relatively high humidity will mean that you will feel comfortably warm when coming out of the water.

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Sri Lanka Blog posts

From the Ireland's most popular travel bloggers

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How to travel Sri Lanka in 2022

12th March 2022 by Journalist On The Run

A practical video about traveling in Sri Lanka in 2022 including travel restrictions and guidelines, what it's like in Sri Lanka right now, best places to stay and visit and why I love traveling here so much!...

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Best beach in Sri Lanka?

2nd March 2022 by Journalist On The Run

Exploring Dalawella Beach and Unawatuna, Sri Lanka.......

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Street food in GALLE, SRI LANKA

28th February 2022 by Journalist On The Run

Exploring the beautiful old town of Galle, Sri Lanka.......

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Sri Lanka south coast

2nd May 2018 by The Daily S'elf

Sri Lanka is one of those destinations that always felt a little too far off, too exotic. A place backpackers travelled, but not as accessible to your regular holiday-goer. How wrong I was, in fact the journey itself was a lot shorter than I ever expected. I joined G Adventures week long Sri Lanka South Coast Sailing trip at the end of March. Flying with Emirates, I travelled from Dublin to Colombo in Sri Lanka via Dubai, the total trip only taking around 12-13 hours....

Weather in Sri Lanka

Our month-by-month guide to the weather and climate in Sri Lanka

31.3

Sri Lanka weather in

January
32.1

Sri Lanka weather in

February
32.3

Sri Lanka weather in

March
31.9

Sri Lanka weather in

April
30.5

Sri Lanka weather in

May
29.1

Sri Lanka weather in

June
28.9

Sri Lanka weather in

July
28.9

Sri Lanka weather in

August
29.2

Sri Lanka weather in

September
29.9

Sri Lanka weather in

October
30.3

Sri Lanka weather in

November
30.5

Sri Lanka weather in

December