The curfew will come into force at 8:00 pm (1700 GMT) and last until 5:00 am (0200 GMT), the sabanews.Net website said, citing a decision taken by the Aden Security Commission.
The decision comes after fierce battles on Sunday in the port of Aden that killed 17 people, among them nine members of the security forces including a colonel, the security sources said.
Security sources said the clashes erupted when forces loyal to President Abedrabbo Mansour Hadi met resistance as they tried to deploy in the port to secure it completely.