Phnom Penh is warmest in March, averaging 38° by day and 26° at night. The wettest month is June with 291 mm, and the year brings about 1793 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 33° | 23° | 16 mm | 11.4 h | Beach weather |
| February | 37° | 23° | 14 mm | 11.6 h | Very hot |
| March | 38° | 26° | 37 mm | 11.9 h | Very hot |
| April | 37° | 26° | 81 mm | 12.3 h | Very hot |
| May | 35° | 26° | 158 mm | 12.5 h | Mild |
| June | 32° | 25° | 291 mm | 12.7 h | Rainy season |
| July | 31° | 25° | 270 mm | 12.6 h | Rainy season |
| August | 31° | 24° | 205 mm | 12.4 h | Rainy season |
| September | 30° | 24° | 276 mm | 12.1 h | Rainy season |
| October | 30° | 24° | 285 mm | 11.7 h | Rainy season |
| November | 30° | 24° | 126 mm | 11.5 h | Mild |
| December | 30° | 23° | 34 mm | 11.3 h | Beach weather |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: January and December — highs around 32°, nights no colder than 23°, and at most 34 mm of rain in a month.
Wet season: June, July, August, September and October — up to 291 mm in a single month.
Serious heat: In February, March and April the average high reaches 38°.