The Koh Samui weather is known for its gorgeous climate with temperatures ranging from 24°C to 34°C throughout the year.
The island has its own hot, dry and rainy seasons which may affect when you’ll want to visit and what you’ll want to do. Be sure to read our handy guide to the weather in Koh Samui before you book your trip.
The Dry Season in Koh Samui
The best time to visit Koh Samui is during the dry season, which typically starts in December and continues through to February.
During the dry season temperatures are slightly cooler and more comfortable than during the hottest times of the year. Expect long warm days with plenty of sun and balmy sea breezes – only the odd light shower occurs although nothing to waylay any planned vacation activities.
The dry season in Koh Samui boasts calmer seas making it the perfect time for snorkelling, diving, sailing and other water sports.
Koh Samui’s Hot Season
If you like it really warm then March through to August is the time to visit Koh Samui. The days during the hot season can be sweltering, which is great for sun worshippers and those who enjoy water sports.
The odd late afternoon thunderstorm should be expected however these are always welcome as they help to reduce the high humidity. If you are planning to embark on strenuous land-based activities during your trip you may prefer to visit Koh Samui during the more temperate peak season. Beach lovers however are in for a treat during these months.
The Rainy Season in Koh Samui
September marks the start of Koh Samui’s rainy season but those who understand the island will know the endless benefits of travelling during this neglected time of year. During the low season Thailand turns lush, fresh and vibrant, this time of year can also be the mildest, most relaxing and tranquil time to travel.
There are fewer tourists in the resorts, prices are cheaper and the service is better. The low season brings a welcome break from the humidity of the hotter months, and the quieter beaches, towns and tourist attractions are easier to explore.
It doesn’t rain every day during this season, the weather is just more unpredictable and there are more cloudy days however temperatures are still in the high 20′s and there’s usually sunshine every day – this season typically lasts until November.
Diving is not ideal during this time as the water will be murky however rates are at their lowest during the rainy season, and many island activities won’t be affected by the rain. Bear in mind that when it comes to the weather during this time rainy days are often balanced by plenty of sunshine and blue skies with rain tending to fall in sharp bursts.
When to Travel to Koh Samui?
When travelling to Koh Samui the most important thing to remember is that Koh Samui is known for its gorgeous weather!
The island is warm and sun-drenched for most months of the year, perfect for sunbathing, swimming, exploring and soaking up the warmth. Koh Samui villas are the ideal home from home during a Koh Samui vacation offering spectacular accommodation close to all the island’s attractions.