March · Thailand
Best time to visit Koh Samui in March Weather, crowds & prices
Weather in Koh Samui in March
Average temperature 25°C, 47 mm of rain, about 31 days with 6+ hours of sunshine and 77% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
March score
9.3/10
Ranked #1 of 12 months
- Avg temp
- 25°C
- Rainfall
- 47 mm
- Humidity
- 77%
- Days with 6h+ sun
- 31
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
March in Koh Samui scores 9.3/10 for beach and coastal travel - the single best month of the year. Expect around 25°C, 47 mm of rain, and roughly 31 days with 6+ hours of sunshine this month.
Koh Samui's ring road links Chaweng's beach, Bophut's Fisherman's Village, and the Big Buddha on the north coast.
March: the best month of the year in Koh Samui
March averages 25°C (77°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rainfall runs 47 mm, so plan one flexible day in three; you still get about 31 days with 6+ hours of sunshine and 12.1 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for Koh Samui at 9.3/10 — the reference point every other month on this page is measured against.
Pack light clothing, swimwear and real sun protection, a packable rain layer.
Plan for peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Koh Samui in March?
- In March, Koh Samui averages 25°C, 47 mm of rain, and about 31 days with 6+ hours of sunshine. Its climate-comfort score is 9.3/10.
- Is March a good time to visit Koh Samui?
- March earns a 9.3/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Koh Samui in March?
- Expect about 47 mm of rain in March. Average humidity is 77% and there are about 31 days with 6+ hours of sunshine.
Curated in Koh Samui
Tickets & experiences
Things to do in Koh Samui
Koh Samui, Thailand. Live activities and tours from GetYourGuide, matched to this destination.