Phnom Penh weather in December
Temperature, rain and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Good
Best time to visit: December – January
What is the weather like in Phnom Penh in December?
In December, Phnom Penh is hot: daytime highs average 30 °C, and even at night it stays warm at around 23 °C. The sun shines for around 7 hours a day. Rain falls on about 6 days, adding up to 32 mm. On about 20 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, December is a good month for a holiday in Phnom Penh.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 50 | 68 | 67 |
| Day | 30° | 30° | 32° |
| Night | 24° | 23° | 23° |
| Sun | 6 h | 7 h | 8 h |
| Rain days | 13 | 6 | 3 |
More details for December
- Daylight
- 11 h 27 min06:12 – 17:39
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 24 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 65 %on averageAll months
- Hot days
- 20 days30 °C or moreAll months
- Time zone
- UTC+7Asia/Phnom_Penh
How the score comes together
- Temperatureweight 50 %58 %
- Sunshineweight 20 %63 %
- Few rainy daysweight 30 %89 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
Phnom Penh in December: quick answers
Is Phnom Penh hot in December?
Yes. In December, Phnom Penh is hot: daytime highs average 30 °C and nights stay around 23 °C. On about 20 days the thermometer climbs to 30 °C or more.
Does it rain much in Phnom Penh in December?
Rain falls on about 6 days, adding up to 32 mm.
Phnom Penh month by month
The whole year in Phnom PenhAll destinations: CambodiaWhere to go in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences