By June Cambodia is firmly within the Southwest monsoon, which has gradually swept northwards across the country.
Typical days are hot and humid with temperatures in the high twenties or low thirties. The humid air is cleared on most days by a short sudden late afternoon downpour or occasional thunderstorm.
Angkor receives far fewer visitors in these months, which for many really enhances the experience. Bear in mind at Angkor though that the temples are steep and the stones can be slippery when wet.
By now the river levels are rising and Tonle Sap Lake filling with water again. Cambodian river cruises can begin to navigate the whole course of the Mekong.