Koh Samui Weather and Climate
Travel and Local Information Guide0
Koh Samui weather comes in three distinct seasons: dry, hot and rainy. Thailand is situated between the Tropic of Cancer and the Equator (slightly closer to the latter), making its climate warm and humid all year round. The humidity level is generally between 70 and 85 per cent, and the temperatures averages at around 28°C.
Located in the Gulf of Thailand, Koh Samui offers all that vacationers from cooler temperate countries could dream of regarding weather conditions. They are generally good year round, and the one thing you will rarely feel is cold. The optimum weather conditions can be enjoyed between December and August.
Samui Weather Forecast
The Dry Season in Samui
The Dry Season in Samui runs roughly from December to February. With warm yet bearable temperatures, little rain, calm seas, and light winds. Many consider this the time of the best Koh Samui weather and the ideal time for a holiday here. For hotels and every tourist-related business, this is peak season.
The Hot Season
The hottest time of year is between March and April - a great time to visit if you can stand 30°C+ temperatures. Around late April/early May, there is normally a sudden – and, for the locals at least, welcome – increase in precipitation. Paradoxically, from June to August is also considered a mini-high season in Samui. The weather usually follows a repeating pattern: strong daytime sunshine followed by late afternoon thunderstorms. It is indeed very agreeable.
The Rainy Season
September through to November sees the arrival of the monsoon and, therefore, the heaviest rainfall. Even at this time, it doesn’t fall every day and often only in short bursts. Koh Samui weather forecasts become increasingly unreliable as the conditions become unpredictable, with slightly rougher seas and winds. Although still great for a beach holiday (particularly if you like your beaches less crowded and your hotel rates lower), this is not the best time to come for diving and snorkelling, as visibility is reduced by around 30 per cent.