Koh Samui weather
Our guide to the weather in Koh Samui during May
Koh Samui is a tropical island off the east coast of Thailand known for its palm-fringed beaches, crystal-clear water, and luxury resorts. We've looked at the most up-to-date weather data for Koh Samui, 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 Koh Samui weather in May.
How warm is it in Koh Samui during May?
May is typically the hottest month in Koh Samui. The temperature hits about 30℃ during the day, falling away to a balmy 28℃ at night. 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 Koh Samui during May?
On average, there will be 7 rainy days during the month, amounting to 154.7mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. Due to the high temperature and humidity, you might expect lots of thunderstorms, however they're actually fairly infrequent at this time of year. On average, May will see just 6 days that produce a storm.
Is it windy in Koh Samui during May?
You're unlikely to experience any strong winds. Expect a gentle breeze that increases to moderate at times during May. 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 Koh Samui during May?
The water around Koh Samui reaches a very pleasant 31℃ during May. 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.
Koh Samui Blog posts
From the UK's most popular travel bloggers
Thailand Travel Guide: The best places to visit in Thailand
30th December 2020 by Stoked to Travel
Thailand is by far the most visited country in Asia, and one of the most popular countries to attract tourists from around the world. It’s renowned for gorgeous beaches, lush jungle, interesting culture and history, and amazing street food. It’s also pretty cheap! On my first ever backpacking trip at 18, Thailand was the first destination we landed in. I remember arriving in a sweaty, chaotic Bangkok and being almost instantly drawn in with its energy and buzz. I’ve returned several times...
How to travel from Phuket to Koh Phangan, Thailand
25th January 2021 by TravelDave
For those travelling to Thailand, you might want to turn your trip into an adventure and go around the region exploring two of the most popular spots, Phuket and Koh Phangan. Your trip to Thailand might start in the capital Bangkok, and you might wish to travel up to the northern region of Thailand and visit Chiang Mai and Chiang Rai. But why not visit the south of Thailand and explore some of the Thai islands?...
Weather in Koh Samui
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