Phnom Penh weather in May
In May, Phnom Penh has an average high of 34 °C93 °F and an average low of 25 °C78 °F, with about 129 mm5.1 in of precipitation. It is the 4th warmest month of the year and ranks 6th for precipitation.
How May compares with other months
Compared with April, May is 1.7 °C3.1 °F cooler on average and wetter by 67 mm2.6 in. Compared with June, May is 1.5 °C2.7 °F warmer on average and drier by 61 mm2.4 in. Daylight lasts about 12.7 hours around the middle of the month. Average relative humidity is 74% and the average cloud amount 83%.
Is May a good time to visit Phnom Penh?
May is not among the most comfortable months by our comfort score: it is hot (average high 34 °C93 °F) and it is fairly wet (129 mm5.1 in). The most comfortable months in Phnom Penh are December.
What to wear in May
For Phnom Penh in May, pack very light, breathable clothing, a sun hat and plenty of water and an umbrella or light rain jacket.
May in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Phnom Penh | 3493 | 2578 | 1295.1 |
| Takeo | 3392 | 2578 | 1305.1 |
| Tân Châu | 3492 | 2578 | 1305.1 |
| Hồng Ngự | 3493 | 2578 | 1285.0 |
| Tịnh Biên | 3391 | 2678 | 1315.2 |
| Hòa Thành | 3494 | 2678 | 1385.4 |
| Hà Tiên | 3188 | 2780 | 1977.8 |
| Long Xuyên | 3492 | 2578 | 1305.1 |
| Trảng Bàng | 3493 | 2578 | 1425.6 |
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 May?
In May the average high in Phnom Penh is 34 °C (93 °F) and the average low is 25 °C (78 °F).
Does it rain a lot in Phnom Penh in May?
On average about 129 mm (5.1 in) of precipitation falls in May; it ranks 6th of the 12 months.
Is May 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 May?
In the middle of May the day in Phnom Penh lasts about 12.7 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Phnom Penh in May?
The average relative humidity in May is about 74%. Combined with warm days, it can feel muggy.
How cloudy is Phnom Penh in May?
On average about 83% of the sky is covered by cloud in May. 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.