Ko Samui weather in July
July in Ko Samui: sweltering, rainy, with clean air — a great time to visit.
#8 of 12 months in Ko Samui · #312 of 604 destinations to visit in July · comfort 78/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Ko Samui climate normals — July
| Daytime high | 30°C / 86°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 27°C / 81°F | |
| Feels like (high) | 35°C / 95°F | |
| Rainfall | 101 mm / 4 in | 🌧 rainy |
| Rainy days | 19 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 12.6 h | |
| Wind | 22 km/h / 14 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Ko Samui in July — FAQ
- Is July a good time to visit Ko Samui?
- July in Ko Samui: sweltering, rainy, with clean air — a great time to visit. It ranks #8 of 12 months for Ko Samui on SeasonMap's comfort score (78/100).
- What is the weather like in Ko Samui in July?
- In July, Ko Samui averages a daily high of 29.8°C and a low of 27.2°C, with about 101.4 mm of rain over roughly 19.2 rainy days.
- What is the air quality in Ko Samui in July?
- Ko Samui has a mean US Air Quality Index of about 34 in July.