Encompassing the Vogelkop montane rain forests ecoregion, the Kebar Valley has a tropical savanna climate, characterized mostly by its tall grass fields and broadleaf forests. The weather in the valley is subject to seasonal influence of the northwest monsoon from November to March, and the southeast trade winds from June to September. Limited meteorological observations indicate a relatively dry season for half of the year along the northern and central part of the valley, especially when the trade winds are blowing from the southeast. Rainfall is high throughout the Kebar Valley, with an average up to annually. Temperatures are uniformly high in the lowlands, which range from about , decreasing with higher elevation towards the Tamrau Mountains to a mean daily temperature from , with an average rainfall from . Relative humidity is also uniformly high in the valley, ranging from 80 to 100 percent. Morning clouds and ground fog may hamper aircraft operations in regions surrounding the valley during dry season.