Climate averages 1991–2020
Phnom Penh weather
in May.
A hot, wet month: the 3rd warmest and the joint 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Phnom Penh: daytime highs average 33.6°C and nights cool to about 25.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 154 mm of rain on roughly 23 days, which makes May a wet month (the joint 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 39 min on an average May day.
The nearest other city in this atlas is Dangkao (7 km away). In May its highs average 33.5°C, about as warm as Phnom Penh, with 154 mm of rain.
Among the 8 cities listed in Cambodia, Phnom Penh ranks joint 2nd of 8 for the warmest May highs and joint 6th of 8 for the driest May (rainfall, lowest first). The mean May high of those 8 cities is 32.9°C; Phnom Penh is 0.6°C warmer than that mean.
From May to June, average highs fall by 1.2°C to 32.4°C, and monthly rainfall stays at 154 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Dangkao in MayCambodia · 7 kmHigh 33.5°C · Low 25.8°C · 154 mm rain
- Takeo in MayCambodia · 65 kmHigh 32.9°C · Low 25.4°C · 147 mm rain
- Kampong Chhnang in MayCambodia · 81 kmHigh 33.6°C · Low 25.9°C · 151 mm rain
- Tân Châu in MayVietnam · 92 kmHigh 32.6°C · Low 25.6°C · 170 mm rain
- Hồng Ngự in MayVietnam · 97 kmHigh 32.4°C · Low 25.5°C · 170 mm rain
- Châu Đốc in MayVietnam · 98 kmHigh 32.3°C · Low 25.5°C · 185 mm rain
- Tịnh Biên in MayVietnam · 107 kmHigh 32.2°C · Low 25.6°C · 207 mm rain
- Hòa Thành in MayVietnam · 136 kmHigh 32.9°C · Low 25.6°C · 203 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.