December · Cambodia
Best time to visit Siem Reap in December Weather, crowds & prices
Weather in Siem Reap in December
Average temperature 25°C, 31 mm of rain, about 30 days with 6+ hours of sunshine and 72% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
8.4/10
Ranked #1 of 12 months
- Avg temp
- 25°C
- Rainfall
- 31 mm
- Humidity
- 72%
- Days with 6h+ sun
- 30
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
December in Siem Reap scores 8.4/10 for sightseeing and cultural travel - the single best month of the year. Expect around 25°C, 31 mm of rain, and roughly 30 days with 6+ hours of sunshine this month.
Siem Reap is the base for Angkor's temples, with a river town of markets and cafés beside it.
December: the best month of the year in Siem Reap
At 25°C (78°F) this is comfortable city weather in December, with sightseeing easiest before lunch and after the afternoon peak.
With around 31 mm of rain, any showers tend to pass through rather than settle in; about 30 days with 6+ hours of sunshine and 11.4 hours of daylight fill the rest.
On our climate-comfort scale this is the top-ranked month of the year for Siem Reap at 8.4/10 — the reference point every other month on this page is measured against.
Pack light clothing, a hat and real sun protection.
Expect peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Siem Reap in December?
- In December, Siem Reap averages 25°C, 31 mm of rain, and about 30 days with 6+ hours of sunshine. Its climate-comfort score is 8.4/10.
- Is December a good time to visit Siem Reap?
- December earns a 8.4/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Siem Reap in December?
- Expect about 31 mm of rain in December. Average humidity is 72% and there are about 30 days with 6+ hours of sunshine.
Curated in Siem Reap
Tickets & experiences
Things to do in Siem Reap
Siem Reap, Cambodia. Live activities and tours from GetYourGuide, matched to this destination.