Climate averages 1991–2020
Siem Reap weather
in August.
A hot, wet month: the 8th 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 Siem Reap: daytime highs average 31.0°C and nights cool to about 25.1°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 162 mm of rain on roughly 24 days, which makes August a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 34 min on an average August day.
The nearest other city in this atlas is Battambang (77 km away). In August its highs average 32.1°C, 1.1°C warmer than Siem Reap, with 124 mm of rain.
Among the 8 cities listed in Cambodia, Siem Reap ranks joint 5th of 8 for the warmest August highs and joint 2nd of 8 for the driest August (rainfall, lowest first). The mean August high of those 8 cities is 30.9°C; Siem Reap is level with that mean.
From August to September, average highs fall by 0.7°C to 30.3°C, and monthly rainfall rises from 162 mm to 244 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
Siem Reap climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.3°C21.9°C | 21.9°C | 9.0 | 1.9 | 11.411 h |
| February | 32.8°C23.5°C | 23.5°C | 13 | 2.6 | 11.712 h |
| March | 34.1°C25.4°C | 25.4°C | 52 | 7.8 | 12.012 h |
| April | 34.2°C26.1°C | 26.1°C | 94 | 13.4 | 12.412 h |
| May | 33.0°C26.1°C | 26.1°C | 148 | 21.4 | 12.713 h |
| June | 32.0°C25.7°C | 25.7°C | 131 | 20.7 | 12.913 h |
| July | 31.3°C25.3°C | 25.3°C | 135 | 22.0 | 12.813 h |
| August, selected | 31.0°C25.1°C | 25.1°C | 162 | 24.3 | 12.613 h |
| September | 30.3°C24.5°C | 24.5°C | 244 | 25.9 | 12.212 h |
| October | 30.0°C23.8°C | 23.8°C | 224 | 23.2 | 11.812 h |
| November | 30.1°C22.8°C | 22.8°C | 62 | 8.8 | 11.512 h |
| December | 30.1°C21.7°C | 21.7°C | 16 | 2.9 | 11.411 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
- Battambang in AugustCambodia · 77 kmHigh 32.1°C · Low 25.2°C · 124 mm rain
- Paoy Paet in AugustCambodia · 144 kmHigh 30.4°C · Low 24.4°C · 181 mm rain
- Kampong Chhnang in AugustCambodia · 151 kmHigh 31.5°C · Low 24.7°C · 186 mm rain
- Chanthaburi in AugustThailand · 208 kmHigh 28.8°C · Low 24.9°C · 328 mm rain
- Phnom Penh in AugustCambodia · 231 kmHigh 31.7°C · Low 24.9°C · 178 mm rain
- Ubon Ratchathani in AugustThailand · 234 kmHigh 30.3°C · Low 24.3°C · 270 mm rain
- Dangkao in AugustCambodia · 234 kmHigh 31.6°C · Low 24.9°C · 178 mm rain
- Kabin Buri in AugustThailand · 241 kmHigh 29.9°C · Low 23.9°C · 271 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 Siem Reap) is explained once on the Siem Reap year overview and on the Sources, method and limits page.