The weather in Phnum Penh in December is hot. The average temperatures are between 22°C and 31°C.
You can expect about 3 to 8 days of rain in Phnum Penh during the month of December. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Phnum Penh in December 2025.
If you’re planning to visit Phnum Penh in the near future, we highly recommend that you review the 14 day weather forecast for Phnum Penh before you arrive.
Temperatures
31° / 22°
Rainy Days
3
Snowy Days
0
Dry Days
28
Rainfall
69
mm
Sun Hours
11.5
Hrs