Climate averages 1991–2020
Phnom Penh weather
in August.
A hot, wet month: the joint 7th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Phnom Penh: daytime highs average 31.7°C and nights cool to about 24.9°C. By daytime temperature it is the joint 7th warmest of the 12 months.
Expect about 178 mm of rain on roughly 26 days, which makes August a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 30 min on an average August day.
The nearest other city in this atlas is Dangkao (7 km away). In August its highs average 31.6°C, about as warm as Phnom Penh, with 178 mm of rain.
Among the 8 cities listed in Cambodia, Phnom Penh ranks 2nd of 8 for the warmest August highs and joint 4th of 8 for the driest August (rainfall, lowest first). The mean August high of those 8 cities is 30.9°C; Phnom Penh is 0.8°C warmer than that mean.
From August to September, average highs fall by 0.7°C to 31.0°C, and monthly rainfall rises from 178 mm to 245 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Phnom Penh climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.7°C22.6°C | 22.6°C | 15 | 3.0 | 11.512 h |
| February | 33.3°C23.6°C | 23.6°C | 8.1 | 1.7 | 11.812 h |
| March | 34.5°C25.1°C | 25.1°C | 36 | 6.1 | 12.112 h |
| April | 34.7°C25.9°C | 25.9°C | 81 | 14.6 | 12.412 h |
| May | 33.6°C25.9°C | 25.9°C | 154 | 22.7 | 12.713 h |
| June | 32.4°C25.4°C | 25.4°C | 154 | 24.3 | 12.813 h |
| July | 31.8°C25.0°C | 25.0°C | 154 | 25.5 | 12.713 h |
| August, selected | 31.7°C24.9°C | 24.9°C | 178 | 25.9 | 12.513 h |
| September | 31.0°C24.5°C | 24.5°C | 245 | 27.1 | 12.212 h |
| October | 30.4°C24.1°C | 24.1°C | 244 | 24.7 | 11.912 h |
| November | 30.3°C23.5°C | 23.5°C | 78 | 11.1 | 11.612 h |
| December | 30.5°C22.7°C | 22.7°C | 27 | 5.1 | 11.511 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Dangkao in AugustCambodia · 7 kmHigh 31.6°C · Low 24.9°C · 178 mm rain
- Takeo in AugustCambodia · 65 kmHigh 31.0°C · Low 24.6°C · 162 mm rain
- Kampong Chhnang in AugustCambodia · 81 kmHigh 31.5°C · Low 24.7°C · 186 mm rain
- Tân Châu in AugustVietnam · 92 kmHigh 31.0°C · Low 24.8°C · 215 mm rain
- Hồng Ngự in AugustVietnam · 97 kmHigh 31.0°C · Low 24.8°C · 215 mm rain
- Châu Đốc in AugustVietnam · 98 kmHigh 30.6°C · Low 24.8°C · 220 mm rain
- Tịnh Biên in AugustVietnam · 107 kmHigh 30.3°C · Low 24.9°C · 245 mm rain
- Hòa Thành in AugustVietnam · 136 kmHigh 30.8°C · Low 24.5°C · 263 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Phnom Penh) is explained once on the Phnom Penh year overview and on the Sources, method and limits page.
Dangkao lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.