Thailand (Koh Samui)
Thailand · Asia
Thailand (Koh Samui) – What you should know
Koh Samui lies on the east coast of the Malay Peninsula and follows the east coast rain rhythm of Thailand — the opposite of Phuket. The best travel time is December to April: dry, sunny weather with temperatures of 27–32°C and calm seas for snorkelling and boat tours to Koh Pha-ngan and Koh Tao.
From October to December — especially November — the north-east monsoon hits Koh Samui with the heaviest rainfall of the year. Flooding and rough seas are not uncommon then. Those who want to visit Thailand at this time are better off switching to the west coast (Phuket, Krabi), which has its best weather then. From May to September, the weather is variable but often still swimable, with short afternoon showers.
Climate Overview
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MAXMax Temp | 31° | 31° | 32° | 33° | 34° | 33° | 33° | 33° | 33° | 32° | 31° | 31° |
MINMin Temp | 26° | 26° | 27° | 27° | 27° | 27° | 27° | 27° | 27° | 26° | 26° | 26° |
☀️Sunshine | 8h | 9h | 10h | 9h | 8h | 8h | 7h | 8h | 6h | 6h | 6h | 7h |
🌊Water Temp | 28° | 29° | 30° | 31° | 31° | 30° | 30° | 30° | 30° | 30° | 29° | 28° |
🌧Rain Days | 8d154mm | 4d66mm | 4d112mm | 6d101mm | 11d152mm | 10d120mm | 11d142mm | 8d95mm | 11d122mm | 15d239mm | 16d474mm | 11d310mm |
Best travel time
The best time to visit Thailand (Koh Samui) is February, March, April, and August. In summer, temperatures rise to 33°C; in winter they can drop to 25°C. During the best travel months, the sun shines up to 9 hours per day — ideal for beach and outdoor activities.
Travel Tips
January offers great weather in Thailand (Koh Samui) with fewer tourists and lower prices — ideal for those who want to avoid the peak season crowds.
Events & Festivals
April
- Songkran (Thailändisches Neujahrsfest)13.–15. April
Das größte Wasserfest Südostasiens verwandelt Chaweng und Lamai in eine riesige Wasserparty. Mit Wasserpistolen und Eimern bespritzt man sich gegenseitig — traditionell ein Segen für das neue Jahr.
May
- Samui Regattavariabel (Ende Mai, 8 Tage)
Asiens renommierteste Segelregatta vor Chaweng Beach. Jachten aus aller Welt messen sich über mehrere Renntage; abends gibt es Sundowner-Partys an den Stränden. Die Veranstaltung zählt zur internationalen Segelrennkalender.
Frequently Asked Questions
- When is the best time to visit Thailand (Koh Samui)?
- The best time to visit Thailand (Koh Samui) is February, March, April, and August. These months offer the most favourable combination of sunshine, temperatures, and low rainfall.
- How warm does it get in Thailand (Koh Samui)?
- In summer, temperatures in Thailand (Koh Samui) can reach up to 33°C. In winter, they may drop to 25°C.
- How much rain does Thailand (Koh Samui) get?
- Thailand (Koh Samui) has a relatively even rainfall pattern with an average of 10 rain days per month. The driest months are February, March, April, and August.
- How warm is the water in Thailand (Koh Samui)?
- Water temperature in Thailand (Koh Samui) ranges from 28°C (January) to 31°C (May). During the best travel months (February, March, April, and August), the water is most pleasant for swimming.
Best Travel Time by Vacation Type
🏖️
Beach Holiday
Warm, sunny, little rain
JanFebMar
🏙️
City Trip
Pleasantly mild, not too hot
JanFebDec
