Phnom Penh weather in December
In December, Phnom Penh has an average high of 32 °C89 °F and an average low of 22 °C71 °F, with about 28 mm1.1 in of precipitation. December is the coldest month of the year and ranks 10th for precipitation.
How December compares with other months
Compared with November, December is about the same temperature and drier by 61 mm2.4 in. Compared with January, December is 1 °C1.8 °F cooler on average and wetter by 11 mm0.5 in. Daylight lasts about 11.4 hours around the middle of the month. Average relative humidity is 71% and the average cloud amount 63%.
Is December a good time to visit Phnom Penh?
Yes — December is one of the most comfortable months to visit Phnom Penh by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in December
For Phnom Penh in December, pack very light, breathable clothing, a sun hat and plenty of water.
December in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Phnom Penh | 3289 | 2271 | 281.1 |
| Takeo | 3188 | 2271 | 311.2 |
| Tân Châu | 3188 | 2271 | 311.2 |
| Hồng Ngự | 3188 | 2171 | 301.2 |
| Tịnh Biên | 3188 | 2271 | 351.4 |
| Hòa Thành | 3289 | 2170 | 271.1 |
| Hà Tiên | 3085 | 2374 | 441.7 |
| Long Xuyên | 3087 | 2271 | 341.3 |
| Trảng Bàng | 3188 | 2170 | 321.2 |
Other months in Phnom Penh
- January34 °C93 °F / 22 °C71 °F
- February36 °C97 °F / 23 °C74 °F
- March37 °C99 °F / 25 °C77 °F
- April36 °C98 °F / 26 °C79 °F
- May34 °C93 °F / 25 °C78 °F
- June31 °C89 °F / 24 °C76 °F
- July31 °C87 °F / 24 °C75 °F
- August30 °C87 °F / 24 °C75 °F
- September30 °C86 °F / 24 °C75 °F
- October30 °C86 °F / 24 °C75 °F
- November31 °C87 °F / 23 °C73 °F
- December32 °C89 °F / 22 °C71 °F
Frequently asked questions
How warm is Phnom Penh in December?
In December the average high in Phnom Penh is 32 °C (89 °F) and the average low is 22 °C (71 °F).
Does it rain a lot in Phnom Penh in December?
On average about 28 mm (1.1 in) of precipitation falls in December; it ranks 10th of the 12 months.
Is December the warmest month in Phnom Penh?
No. The warmest month in Phnom Penh is March, with an average high of 37 °C (99 °F). The coldest month is December, with an average low of 22 °C (71 °F).
How long is the day in Phnom Penh in December?
In the middle of December the day in Phnom Penh lasts about 11.4 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Phnom Penh in December?
The average relative humidity in December is about 71%. Combined with warm days, it can feel muggy.
How cloudy is Phnom Penh in December?
On average about 63% of the sky is covered by cloud in December. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.