What to expect in Siem Reap in December
December is one of the best times to visit Siem Reap. Expect 30° / 19°, the biggest crowds of the year and premium prices.
Siem Reap weather in December
Typical conditions in Siem Reap during December, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 30°C 86°F |
|---|---|
| Average low | 19°C 66°F |
| Rainfall | Dry 10/100 |
| Total rainfall | 7 mm0.3 in |
| Daylight | 11 h 21 min |
| How it feels | Hot — midday shade matters |
Average highs sit around 30°C with lows near 19°C. It is one of the drier months — pack light.
Crowds & demand
Crowd levels are High for Siem Reap — the biggest crowds of the year.
Prices & value
This month counts as high season: premium prices.
What to pack
Lightweight, breathable clothes, strong sun protection and a refillable bottle — highs near 30°C make midday heat the main constraint. Rain gear is largely optional this month, which keeps your bag light.
What it costs
This is peak pricing for Siem Reap. Expect to pay a premium on flights and accommodation, and to book considerably further ahead than usual.
Who this month suits
- Travellers who want the most reliable weather
- Families tied to school holidays
Events & what’s on
No major festivals fall in December, so the destination feels like its everyday self.
Siem Reap in December compared with nearby months
If your dates are flexible by a few weeks, this is what shifting them actually buys you.
| Month | Temp | Crowds | Price | Score |
|---|---|---|---|---|
| October | 30° / 23° | Low | $ | 64 |
| November | 30° / 21° | Moderate | $$ | 55 |
| December · This month | 30° / 19° | High | $$$ | 46 |
| January | 31° / 19° | High | $$$ | 47 |
| February | 33° / 21° | High | $$$ | 46 |
These months score higher for Siem Reap on the same blend of weather, crowds and price. Same destination, better odds.
Or go somewhere else in December
If the destination is negotiable but the month is not, these places are at their best in December.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated October 2026
