Siem Reap weather in May
May in Siem Reap: sweltering, rainy, with very humid — a good time to visit.
#8 of 12 months in Siem Reap · #536 of 604 destinations to visit in May · comfort 62/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Siem Reap climate normals — May
| Daytime high | 33°C / 92°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 27°C / 80°F | |
| Feels like (high) | 40°C / 104°F | |
| Rainfall | 124 mm / 4.9 in | 🌧 rainy |
| Rainy days | 19 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 12.7 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 58 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Siem Reap in May — FAQ
- Is May a good time to visit Siem Reap?
- May in Siem Reap: sweltering, rainy, with very humid — a good time to visit. It ranks #8 of 12 months for Siem Reap on SeasonMap's comfort score (62/100).
- What is the weather like in Siem Reap in May?
- In May, Siem Reap averages a daily high of 33.4°C and a low of 26.6°C, with about 124.1 mm of rain over roughly 18.8 rainy days.
- What is the air quality in Siem Reap in May?
- Siem Reap has a mean US Air Quality Index of about 58 in May.