Ko Samui weather in April
April in Ko Samui: sweltering, rainy, with clean air — an excellent time to visit.
#6 of 12 months in Ko Samui · #282 of 604 destinations to visit in April · comfort 80/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Ko Samui climate normals — April
| Daytime high | 30°C / 86°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 28°C / 82°F | |
| Feels like (high) | 37°C / 99°F | |
| Rainfall | 112 mm / 4.4 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 25°C / 76°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 12.3 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 49 | 🍃 good |
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 April — FAQ
- Is April a good time to visit Ko Samui?
- April in Ko Samui: sweltering, rainy, with clean air — an excellent time to visit. It ranks #6 of 12 months for Ko Samui on SeasonMap's comfort score (80/100).
- What is the weather like in Ko Samui in April?
- In April, Ko Samui averages a daily high of 30.1°C and a low of 27.6°C, with about 112.3 mm of rain over roughly 14 rainy days.
- What is the air quality in Ko Samui in April?
- Ko Samui has a mean US Air Quality Index of about 49 in April.