The DRC straddles the Equator, so the climate varies significantly between north and south. In general, it is hot and humid everywhere, but the timing of the dry and rainy seasons differs depending on where you are.
For the southern half of the country -- including Kinshasa, Lubumbashi, and the Katanga region -- the long dry season runs from May to September, with June and July the driest months. This is the most comfortable time to travel, with lower humidity and less rain. The rainy season from October to April brings heavy downpours that can turn already poor roads into impassable mud.
In the central equatorial zone -- around Mbandaka and the deep forest interior -- there is no true dry season. Rain falls year-round, though it is slightly less intense from January to February. Expect oppressive humidity at all times.
The eastern highlands around Goma and Bukavu are cooler due to altitude, with temperatures dropping to 15-20 degrees Celsius at night. The long dry season from June to September is the best window for gorilla trekking and volcano hikes, with drier trails and better visibility. A shorter dry spell from mid-December to mid-February also works. The rainy months make trekking harder but not impossible.
The north, above the Equator, follows the opposite pattern, with its dry season running from December to February.
In practical terms, the dry season (June to September) is the best time to visit most of the country. But in the DRC, security conditions matter more than weather. Always check the current situation in your destination before traveling, especially in the east. The best weather in the world is useless if the road is blocked by an armed checkpoint.
Temperatures in Kinshasa hover around 25-32 degrees Celsius year-round. Pack light, breathable clothes and expect to sweat. At altitude in the east, you will need warmer layers for evenings and early morning treks.