Climate averages 1991–2020
Siem Reap weather
in January.
A hot, very dry month: the joint 6th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a hot month in Siem Reap: daytime highs average 31.3°C and nights cool to about 21.9°C. By daytime temperature it is the joint 6th warmest of the 12 months.
Expect about 9.0 mm of rain on roughly 2 days, which makes January a very dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 11 h 26 min on an average January day.
The nearest other city in this atlas is Battambang (77 km away). In January its highs average 31.7°C, about as warm as Siem Reap, with 12 mm of rain.
Among the 8 cities listed in Cambodia, Siem Reap ranks 6th of 8 for the warmest January highs and 1st of 8 for the driest January (rainfall, lowest first). The mean January high of those 8 cities is 31.3°C; Siem Reap is level with that mean.
From January to February, average highs rise by 1.6°C to 32.8°C, and monthly rainfall rises from 9.0 mm to 13 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Battambang in JanuaryCambodia · 77 kmHigh 31.7°C · Low 21.5°C · 12 mm rain
- Paoy Paet in JanuaryCambodia · 144 kmHigh 31.2°C · Low 21.0°C · 11 mm rain
- Kampong Chhnang in JanuaryCambodia · 151 kmHigh 31.9°C · Low 22.5°C · 10 mm rain
- Chanthaburi in JanuaryThailand · 208 kmHigh 30.4°C · Low 22.2°C · 29 mm rain
- Phnom Penh in JanuaryCambodia · 231 kmHigh 31.7°C · Low 22.6°C · 15 mm rain
- Ubon Ratchathani in JanuaryThailand · 234 kmHigh 30.4°C · Low 19.1°C · 4.7 mm rain
- Dangkao in JanuaryCambodia · 234 kmHigh 31.7°C · Low 22.6°C · 15 mm rain
- Kabin Buri in JanuaryThailand · 241 kmHigh 30.9°C · Low 20.3°C · 8.9 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.