Siem Reap weather in January
January in Siem Reap: sweltering, dry — one of the best months to visit.
#1 of 12 months in Siem Reap · #144 of 604 destinations to visit in January · comfort 82/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Siem Reap climate normals — January
| Daytime high | 31°C / 88°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 21°C / 71°F | |
| Feels like (high) | 34°C / 93°F | |
| Rainfall | 18 mm / 0.7 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 66% | 💧 humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 10.1 h/day | |
| Daylight | 11.4 h | |
| Wind | 14 km/h / 8 mph | |
| Air quality (US AQI) | 51 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Siem Reap in January — FAQ
- Is January a good time to visit Siem Reap?
- January in Siem Reap: sweltering, dry — one of the best months to visit. It ranks #1 of 12 months for Siem Reap on SeasonMap's comfort score (82/100).
- What is the weather like in Siem Reap in January?
- In January, Siem Reap averages a daily high of 30.9°C and a low of 21.4°C, with about 17.7 mm of rain over roughly 1 rainy days.
- What is the air quality in Siem Reap in January?
- Siem Reap has a mean US Air Quality Index of about 51 in January.