December · Cambodia
Best time to visit Phnom Penh in December Weather, crowds & prices
Weather in Phnom Penh in December
Average temperature 26°C, 50 mm of rain, about 30 days with 6+ hours of sunshine and 73% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
7.4/10
Ranked #3 of 12 months
- Avg temp
- 26°C
- Rainfall
- 50 mm
- Humidity
- 73%
- Days with 6h+ sun
- 30
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
December in Phnom Penh scores 7.4/10 for sightseeing and cultural travel - one of the top 12-month picks (#3). Expect around 26°C, 50 mm of rain, and roughly 30 days with 6+ hours of sunshine this month.
Phnom Penh pairs royal palaces and a riverfront with sobering museums of the Khmer Rouge years.
December in Phnom Penh: strong conditions, 3rd of 12
December averages 26°C (79°F) and humidity near 73%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 50 mm, so plan one flexible day in three; you still get about 30 days with 6+ hours of sunshine and 11.5 hours of daylight.
It scores 7.4/10 here, 3rd of 12 months, against 8.1/10 in the destination's best month.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
Figure on peak pricing, with 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 Phnom Penh in December?
- In December, Phnom Penh averages 26°C, 50 mm of rain, and about 30 days with 6+ hours of sunshine. Its climate-comfort score is 7.4/10.
- Is December a good time to visit Phnom Penh?
- December earns a 7.4/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Phnom Penh in December?
- Expect about 50 mm of rain in December. Average humidity is 73% and there are about 30 days with 6+ hours of sunshine.
Curated in Phnom Penh
Tickets & experiences
Things to do in Phnom Penh
Phnom Penh, Cambodia. Live activities and tours from GetYourGuide, matched to this destination.