The talks had originally been due to start on Sunday, but the arrival of one of the Yemeni delegations has been delayed, said UN spokesman Ahmad Fawzi.
UN chief Ban Ki-moon will brief envoys from the Gulf Cooperation Council and the G16 group, comprising Security Council members and Western powers, on Sunday, before meeting Yemeni delegates the following morning.
Ban hopes the talks will produce a "new dynamic that will build confidence between the Yemeni actors and yield concrete benefits for the population," said Fawzi.
"The talks will start as proximity talks, with the hope of bringing the parties to sit around the same table eventually," said Fawzi.
They are currently scheduled to last two or three days. Ban's spokesman, Stephane Dujarric, said the global body was striving to be realistic about the talks.
"Bringing these parties together has been challenging, herculean," he told reporters.