Ko Samui weather in June
June in Ko Samui: sweltering, a little rain, with clean air — one of the best months to visit.
#2 of 12 months in Ko Samui · #228 of 604 destinations to visit in June · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Ko Samui climate normals — June
| Daytime high | 30°C / 86°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 28°C / 82°F | |
| Feels like (high) | 36°C / 97°F | |
| Rainfall | 71 mm / 2.8 in | 🌦 some rain |
| Rainy days | 19 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 10 h/day | |
| Daylight | 12.7 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 30 | 🍃 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 June — FAQ
- Is June a good time to visit Ko Samui?
- June in Ko Samui: sweltering, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Ko Samui on SeasonMap's comfort score (85/100).
- What is the weather like in Ko Samui in June?
- In June, Ko Samui averages a daily high of 30.2°C and a low of 27.5°C, with about 71.1 mm of rain over roughly 18.6 rainy days.
- What is the air quality in Ko Samui in June?
- Ko Samui has a mean US Air Quality Index of about 30 in June.