Phnom Penh weather in May
May in Phnom Penh: sweltering, rainy, with very humid — a fair time to visit.
#8 of 12 months in Phnom Penh · #547 of 604 destinations to visit in May · comfort 58/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Phnom Penh climate normals — May
| Daytime high | 34°C / 93°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Feels like (high) | 40°C / 104°F | |
| Rainfall | 136 mm / 5.3 in | 🌧 rainy |
| Rainy days | 22 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 10.4 h/day | |
| Daylight | 12.7 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 67 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Phnom Penh in May — FAQ
- Is May a good time to visit Phnom Penh?
- May in Phnom Penh: sweltering, rainy, with very humid — a fair time to visit. It ranks #8 of 12 months for Phnom Penh on SeasonMap's comfort score (58/100).
- What is the weather like in Phnom Penh in May?
- In May, Phnom Penh averages a daily high of 33.7°C and a low of 26.3°C, with about 135.7 mm of rain over roughly 22.2 rainy days.
- What is the air quality in Phnom Penh in May?
- Phnom Penh has a mean US Air Quality Index of about 67 in May.