Ko Samui weather in March
March in Ko Samui: sweltering, dry, with very humid — one of the best months to visit.
#1 of 12 months in Ko Samui · #88 of 604 destinations to visit in March · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Ko Samui climate normals — March
| Daytime high | 29°C / 85°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 27°C / 80°F | |
| Feels like (high) | 35°C / 95°F | |
| Rainfall | 27 mm / 1.1 in | ☀️ dry |
| Rainy days | 6 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 24°C / 74°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 12.1 h | |
| Wind | 20 km/h / 13 mph | |
| Air quality (US AQI) | 56 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Ko Samui?
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Ko Samui in March — FAQ
- Is March a good time to visit Ko Samui?
- March in Ko Samui: sweltering, dry, with very humid — one of the best months to visit. It ranks #1 of 12 months for Ko Samui on SeasonMap's comfort score (87/100).
- What is the weather like in Ko Samui in March?
- In March, Ko Samui averages a daily high of 29.3°C and a low of 26.9°C, with about 27.2 mm of rain over roughly 5.8 rainy days.
- What is the air quality in Ko Samui in March?
- Ko Samui has a mean US Air Quality Index of about 56 in March.