Rising seas have forced more than a quarter of individuals, many of whom are in the north, from their homes.
According to Ocha, the displaced were moving to higher terrain in search of safety, but the rains have also made it more challenging to deliver help to those in need.
With a population of over 11 million, South Sudan has seen some of its worst flood seasons in recent memory.
A government rescue organization in the eastern region of Pibor reports that 112,000 people have lost their homes.
Joseph Nyao, director of Relief and Rehabilitation, told the news from Pibor that those who have escaped to higher ground “don’t even have food; they left everything in a previous location.”
He went on to say that residents in flood-prone areas were being advised by the government to “move immediately to higher grounds that have been identified by local authorities for their safety.”
The displacement is ongoing, and the water level is still rising.
The administration warned the world community in May that the country would likely see extraordinary floods in the months that followed.