Tropical monsoon climate. Monsoon season is from May to November. The most pleasant season is the dry season, from November/December to April. In the north, winters can be colder, while throughout most of the country temperatures remain fairly constant. There is often seasonal flooding in Phnom Penh and the rest of Cambodia in late-July and early-August; travel may be disrupted.

Lightweight clothing and cottons are worn all year. Rainwear is essential during the rainy season.

Cambodia shares borders in the north with Laos and Thailand, in the east with Vietnam and in the southwest with the Gulf of Thailand. The landscape comprises tropical rainforest and fertile cultivated land traversed by many rivers. In the northeast area rise highlands. The capital is located at the junction of the Mekong and Tonle Sap rivers. The latter flows from a large inland lake, also called Tonle Sap, situated in the centre of the country. There are numerous offshore islands along the southwest coast.