Best time to visit Siem Reap

December is the best month in Siem Reap, scoring 72 out of 100, with May the weakest at 33. The 39-point spread means timing is worth planning around without being decisive. Only 3 months come close to the top, which makes the timing narrow.

March is the warmest month at 36.7 °C and September the coolest at 30.4 °C — a 6.3 °C spread across the year. 308 days a year top 30 °C, more than a third of the calendar, so heat is the baseline here rather than a season.

There is a real wet season here. May to September carry the rain — up to 26 wet days in a month — while January, February, November and December drop as low as 2. That 24-day gap is the biggest single difference between a good month and a bad one in Siem Reap, and it moves further than the temperature does.

Daylight barely moves: about 12.9 hours whatever the month, which removes one variable from the decision entirely.

The three strongest months are December, November, January. The one to think twice about is May. Each month below has its own page with rainfall reliability, extremes, daylight and crowd levels.

Siem Reap month by month