Best Time to Visit Siem Reap
The best time to visit Siem Reap is November to January, when the average temperature is 25–26°C and rainfall is low for Siem Reap, at 7–33 mm a month.
Siem Reap weather by month
The wettest month in Siem Reap is September with 228 mm of rain, and the warmest is March at an average 31°C. The coolest is December at 25°C.
| Month | Average temperature | Rainfall | Verdict |
|---|---|---|---|
| January | 26°C / 80°F | 9 mm | Best |
| February | 29°C / 84°F | 12 mm | Hot |
| March | 31°C / 87°F | 38 mm | Hot |
| April | 31°C / 87°F | 68 mm | Hot |
| May | 29°C / 85°F | 139 mm | Hot |
| June | 28°C / 82°F | 163 mm | Wet |
| July | 27°C / 81°F | 207 mm | Wet |
| August | 27°C / 80°F | 203 mm | Wet |
| September | 27°C / 80°F | 228 mm | Wet |
| October | 27°C / 80°F | 121 mm | Rainy |
| November | 26°C / 79°F | 33 mm | Best |
| December | 25°C / 78°F | 7 mm | Best |
How we pick the best months
- Best: an average temperature of 15–28°C and low rainfall for Siem Reap: under 150 mm, and no more than 118 mm, a quarter above Siem Reap's median month (never set below 60 mm).
- If no month qualifies, we show the three driest months that average 10–30°C instead.
- Wet: 150 mm of rain or more. Rainy: more than 118 mm. Hot: 29°C or more on average. Cool: under 15°C. Cold: under 5°C.
Averages cover day and night, so afternoons are warmer than the figure shown. Weather is only one reason to pick a month: school holidays, festivals and prices matter too.
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Where these numbers come from
Monthly averages for January 2001 – December 2020 from the NASA POWER project, for the area around Siem Reap-Angkor International (SAI) at 13.37, 104.22. The model covers a grid about 50 km across, so a coastal or hilly spot can run a degree or two different. Retrieved 12 September 2026.
The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center (LaRC) Prediction of Worldwide Energy Resource (POWER) Project funded through the NASA Earth Science/Applied Science Program.