Siem Reap Weather & Climate: Best Time to Visit

With minimal seasonal shifts, Siem Reap experiences a constant climate year-round. Typically, average maximum daytime temperatures range from a very hot 36°C (97°F) in April to a very warm 32°C (90°F) in the coolest month, December.

Nights vary from 27°C (81°F) in April to around 22°C (72°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Siem Reap has a notably wet climate with abundant precipitation, recording 1470 mm (58 in) of rainfall per year. The climate in Siem Reap shows significant variation throughout the year. Expect heavy rainfall in September, the wettest month, with an average of 286 mm (11 in) of precipitation over 18 rainy days.

In contrast, the driest month January offers drier and sunnier days, with around 9.8 mm (0.4 in) of rainfall over a single rainy day. For more details, please visit our Siem Reap Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

The relative humidity is high throughout the year in Siem Reap.

The city experiences its highest humidity in September, reaching 75%. In March, the humidity drops to its lowest level at 58%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year