Climate averages 1991–2020
Siem Reap weather
in May.
A hot, wet month: the 3rd warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Siem Reap: daytime highs average 33.0°C and nights cool to about 26.1°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 148 mm of rain on roughly 21 days, which makes May a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 44 min on an average May day.
The nearest other city in this atlas is Battambang (77 km away). In May its highs average 34.1°C, 1.1°C warmer than Siem Reap, with 115 mm of rain.
Among the 8 cities listed in Cambodia, Siem Reap ranks joint 5th of 8 for the warmest May highs and 4th of 8 for the driest May (rainfall, lowest first). The mean May high of those 8 cities is 32.9°C; Siem Reap is 0.1°C warmer than that mean.
From May to June, average highs fall by 1.0°C to 32.0°C, and monthly rainfall falls from 148 mm to 131 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
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, selected | 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
May in nearby cities
- Battambang in MayCambodia · 77 kmHigh 34.1°C · Low 25.8°C · 115 mm rain
- Paoy Paet in MayCambodia · 144 kmHigh 33.0°C · Low 25.4°C · 145 mm rain
- Kampong Chhnang in MayCambodia · 151 kmHigh 33.6°C · Low 25.9°C · 151 mm rain
- Chanthaburi in MayThailand · 208 kmHigh 30.0°C · Low 25.5°C · 320 mm rain
- Phnom Penh in MayCambodia · 231 kmHigh 33.6°C · Low 25.9°C · 154 mm rain
- Ubon Ratchathani in MayThailand · 234 kmHigh 33.0°C · Low 25.4°C · 181 mm rain
- Dangkao in MayCambodia · 234 kmHigh 33.5°C · Low 25.8°C · 154 mm rain
- Kabin Buri in MayThailand · 241 kmHigh 32.5°C · Low 24.9°C · 174 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.