Sri Lanka weather
Our guide to the weather in Sri Lanka during September
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 2026, 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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5th November 2025 by Conversant Traveller
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30th December 2025 by Globalmouse Travels
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3rd September 2024 by The World in My Pocket
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12th January 2025 by PommieTravels
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