The ceasefire between Yemen’s Houthi rebels and forces loyal to President Abdrabbuh Mansur Hadi in the port city of Hodeida came into existence on December 18.
The agreement was reached in the UN-mediated talks held in Stockholm.
According to the agreement, all combatants should withdraw from Hodeida in 21 days.
The UN observers will set up a monitoring team of government and rebel representatives to oversee the peace.