Climate averages 1991–2020
Siem Reap weather
in April.
A very hot, wet month: the warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a very hot month in Siem Reap: daytime highs average 34.2°C and nights cool to about 26.1°C. By daytime temperature it is the warmest month of the year.
Expect about 94 mm of rain on roughly 13 days, which makes April a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 25 min on an average April day.
The nearest other city in this atlas is Battambang (77 km away). In April its highs average 35.3°C, 1.2°C warmer than Siem Reap, with 83 mm of rain.
Among the 8 cities listed in Cambodia, Siem Reap ranks 6th of 8 for the warmest April highs and joint 6th of 8 for the driest April (rainfall, lowest first). The mean April high of those 8 cities is 34.2°C; Siem Reap is level with that mean.
From April to May, average highs fall by 1.2°C to 33.0°C, and monthly rainfall rises from 94 mm to 148 mm.
The annual picture
April 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, selected | 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 | 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
April in nearby cities
- Battambang in AprilCambodia · 77 kmHigh 35.3°C · Low 25.6°C · 83 mm rain
- Paoy Paet in AprilCambodia · 144 kmHigh 34.6°C · Low 25.3°C · 80 mm rain
- Kampong Chhnang in AprilCambodia · 151 kmHigh 34.9°C · Low 26.1°C · 86 mm rain
- Chanthaburi in AprilThailand · 208 kmHigh 31.0°C · Low 25.4°C · 122 mm rain
- Phnom Penh in AprilCambodia · 231 kmHigh 34.7°C · Low 25.9°C · 81 mm rain
- Ubon Ratchathani in AprilThailand · 234 kmHigh 34.5°C · Low 25.3°C · 81 mm rain
- Dangkao in AprilCambodia · 234 kmHigh 34.7°C · Low 25.9°C · 81 mm rain
- Kabin Buri in AprilThailand · 241 kmHigh 34.2°C · Low 24.8°C · 62 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.