Before you go
When is the best time of year to train in Thailand?
Updated 2026-09-01
The short answer
November to February is the cool dry season across most of the country and the most comfortable stretch for twice-daily training. March to May is hot enough to change how you train. In the north, the burning season from roughly February to April brings poor air quality, which matters when you are breathing hard for hours a day.
Heat is not a minor factor. Training twice a day in April in the south means the second session happens in conditions your body has never met, and the first week of any trip is already an adaptation. People who arrive in the hot months tend to lose their first few days to it.
Rain is less of a problem than people expect, because most camps train under cover and the rain arrives in bursts rather than settling in for the day. The rainy season is also not one season: the Andaman and Gulf coasts run on different calendars, so a wet month in Phuket is not a wet month in Koh Samui.
Air quality in the north is the factor that rarely appears in the brochure. If you are heading to Chiang Mai between February and April, look at the readings before you commit rather than after.
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