Siem Reap weather in August
August in Siem Reap: sweltering, soaked, with clean air — a fair time to visit.
#8 of 12 months in Siem Reap · #504 of 604 destinations to visit in August · comfort 58/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Siem Reap climate normals — August
| Daytime high | 31°C / 88°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 78°F | |
| Feels like (high) | 37°C / 99°F | |
| Rainfall | 151 mm / 6 in | ⛈ soaked |
| Rainy days | 23 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 9 h/day | |
| Daylight | 12.6 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Siem Reap in August — FAQ
- Is August a good time to visit Siem Reap?
- August in Siem Reap: sweltering, soaked, with clean air — a fair time to visit. It ranks #8 of 12 months for Siem Reap on SeasonMap's comfort score (58/100).
- What is the weather like in Siem Reap in August?
- In August, Siem Reap averages a daily high of 31.2°C and a low of 25.4°C, with about 151.4 mm of rain over roughly 22.8 rainy days.
- What is the air quality in Siem Reap in August?
- Siem Reap has a mean US Air Quality Index of about 32 in August.