A Tale Of Two Seasons

Due to its location close to the equator yet outside the typical cyclone zones of the Pacific and Indian Oceans, it is possible to sail all year round in Thailand’s waters. In essence, Thailand has two main seasons; the rainy season and the dry season, sometimes referred to as the south west monsoon and the north east monsoon. Seasonal winds tend to be predictable; however, tropical storms and winds can change the weather quickly.

North East Monsoon

Dry Season
Running from November to April, the north east monsoon has wind speeds between 5 and 20 knots from the north east. Winds are typically stable, skies are clear with minimal rainfall and temperatures rarely exceed 30°C, providing ideal conditions for getting out on the water. Please note that winds are usually weak during January and February, so boats with sail only may not have sufficient drive.

South West Monsoon

Wet Season
Taking place from May to October, the south west monsoon is characterised by increased winds – between 10 and 30 knots from the southwest, providing a little more oomph for sailing – and heavy rain periods for a couple of hours in the afternoon and early evening.

Due to the prevailing winds, it is not possible to anchor on Phuket’s west coast and sailors are instead advised to anchor on the east side of the island or in protected bays. Sailing from Phang-Nga Bay to Koh Pi Pi is possible in strong sea conditions, however, the Similan Islands in the west of the Andaman Sea are closed during the south west monsoon.

In the Gulf of Thailand, particularly around Pattaya and the Koh Chang Archipegelo, the south west monsoon is the best time to sail as light and steady south west winds prevail. Blue skies and warm temperatures are expected during this time of year and, most importantly, calm sea conditions.