With a population of around 40,700, Ouesso sits in Sangha, Republic of the Congo. The city operates in the Africa/Brazzaville time zone.
Recent weather here gives a sense of typical conditions: in 2025, Ouesso recorded a mean annual temperature of 77°F, ranging from 65°F lows in January to 94°F highs in March, with about 58 inches of precipitation across the year.