Phnom Penh weather in August
In August, Phnom Penh has an average high of 30 °C87 °F and an average low of 24 °C75 °F, with about 167 mm6.6 in of precipitation. It is the 8th warmest month of the year and ranks 4th for precipitation.
How August compares with other months
Compared with July, August is about the same temperature. Compared with September, August is about the same temperature and drier by 23 mm0.9 in. Daylight lasts about 12.5 hours around the middle of the month. Average relative humidity is 85% and the average cloud amount 90%.
Is August a good time to visit Phnom Penh?
August is not among the most comfortable months by our comfort score: it is hot (average high 30 °C87 °F), it is fairly wet (167 mm6.6 in) and it is humid (85%). The most comfortable months in Phnom Penh are December.
What to wear in August
For Phnom Penh in August, pack very light, breathable clothing, a sun hat and plenty of water and an umbrella or light rain jacket.
August in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Phnom Penh | 3087 | 2475 | 1676.6 |
| Takeo | 3086 | 2475 | 1716.7 |
| Tân Châu | 3086 | 2475 | 1716.7 |
| Hồng Ngự | 3087 | 2475 | 1475.8 |
| Tịnh Biên | 2985 | 2576 | 1857.3 |
| Hòa Thành | 3087 | 2475 | 1666.5 |
| Hà Tiên | 2984 | 2678 | 27611 |
| Long Xuyên | 3086 | 2475 | 1606.3 |
| Trảng Bàng | 3086 | 2475 | 1656.5 |
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 August?
In August the average high in Phnom Penh is 30 °C (87 °F) and the average low is 24 °C (75 °F).
Does it rain a lot in Phnom Penh in August?
On average about 167 mm (6.6 in) of precipitation falls in August; it ranks 4th of the 12 months.
Is August 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 August?
In the middle of August the day in Phnom Penh lasts about 12.5 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Phnom Penh in August?
The average relative humidity in August is about 85%. Combined with warm days, it can feel muggy.
How cloudy is Phnom Penh in August?
On average about 90% of the sky is covered by cloud in August. 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.