Cambodia’s climate is tropical and the weather is hot and humid practically all year round. However, there are four main seasons; the cool and dry season from November to February, the hot and dry season from March to May, the hot and wet season from June-August, and the cool and wet season that lasts from September-October.
The temperatures in Cambodia are significantly higher than other Asian countries such as Thailand, Laos and Vietnam, with average temperatures of between 28-35?C in the hot season. The weather is also very humid during this period. April is by far the hottest month, and only travel during this time if you are used to walking around in the heat.
However, things cool down to around 25-30?C in November to February, and this is a good time for temple hopping. There are occasional cool evenings, but Cambodia could never be referred to as cold and you will rarely need a jacket, if ever.
The rain descends on Cambodia from June to October, with heavy showers and storms sweeping the entire country. However, the rain is mainly restricted to the afternoon, so it is still possible to rise early and spend the morning exploring and relax in the afternoon and evening.
Tourist numbers are low during the rainy season, so this is a good time to beat the crowds.
The peak tourist season is from December to January and if you are travelling in Cambodia during this time it is a good idea to book popular hotels in advance, although there is usually plenty of accommodation available.