The weather in Phnum Penh in September is very hot. The average temperatures are between 25°C and 32°C, drinking water regularly is advisable.
There’s going to be many days of rain during the month of September in Phnum Penh.
Phnum Penh should expect an average of 15 to 22 days of rain, so be sure to bring along a waterproof jacket to stay dry this month!
Our weather forecast can give you a great sense of what weather to expect in Phnum Penh in September 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
32° / 25°
Rainy Days
20
Snowy Days
0
Dry Days
10
Rainfall
353
mm
Sun Hours
10.3
Hrs
