Phnom Penh weather in December
December in Phnom Penh: hot, dry, with clean air — one of the best months to visit.
#1 of 12 months in Phnom Penh · #193 of 604 destinations to visit in December · comfort 78/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Phnom Penh climate normals — December
| Daytime high | 30°C / 86°F | 🥵 hot |
|---|---|---|
| Nighttime low | 23°C / 73°F | |
| Feels like (high) | 33°C / 91°F | |
| Rainfall | 27 mm / 1.1 in | ☀️ dry |
| Rainy days | 4 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 21°C / 69°F | |
| Sunshine | 9.9 h/day | |
| Daylight | 11.5 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 48 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Phnom Penh in December — FAQ
- Is December a good time to visit Phnom Penh?
- December in Phnom Penh: hot, dry, with clean air — one of the best months to visit. It ranks #1 of 12 months for Phnom Penh on SeasonMap's comfort score (78/100).
- What is the weather like in Phnom Penh in December?
- In December, Phnom Penh averages a daily high of 30.2°C and a low of 22.5°C, with about 26.9 mm of rain over roughly 4.2 rainy days.
- What is the air quality in Phnom Penh in December?
- Phnom Penh has a mean US Air Quality Index of about 48 in December.