Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 33° / 22° | 1 | 30 | 0 | 30 mm | Good | Phnum Penh in January |
| February | 35° / 24° | 1 | 27 | 0 | 30 mm | Ok | Phnum Penh in February |
| March | 36° / 26° | 3 | 28 | 0 | 75 mm | Ok | Phnum Penh in March |
| April | 36° / 27° | 10 | 20 | 0 | 223 mm | Bad | Phnum Penh in April |
| May | 35° / 27° | 15 | 16 | 0 | 268 mm | Bad | Phnum Penh in May |
| June | 34° / 26° | 16 | 14 | 0 | 226 mm | Bad | Phnum Penh in June |
| July | 33° / 25° | 15 | 16 | 0 | 206 mm | Ok | Phnum Penh in July |
| August | 33° / 25° | 16 | 15 | 0 | 244 mm | Ok | Phnum Penh in August |
| September | 32° / 25° | 20 | 10 | 0 | 353 mm | Ok | Phnum Penh in September |
| October | 32° / 25° | 16 | 15 | 0 | 363 mm | Ok | Phnum Penh in October |
| November | 31° / 24° | 6 | 24 | 0 | 160 mm | Good | Phnum Penh in November |
| December | 31° / 22° | 3 | 28 | 0 | 69 mm | Good | Phnum Penh in December |