Suspected Islamic State group (IS) jihadists in the city also shot dead Sheikh Ali Othman, a Sufi imam who was considered a moderate, security officials said.
The curfew will come into force at 8 pm and last until 5 am, the sabanews.Net website said, citing a decision by the Aden Security Commission.
The decision comes after fierce battles yesterday in the port of Aden killed 22 people, among them 10 members of the security forces including a colonel, the security sources said.
They said the fighting lasted for several hours and that pro-Hadi forces eventually managed to take control of the facility.
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Witnesses said they saw an unprecedented number of armed men in Aden yesterday, without being able to identify them.
Hadi toured parts of the city, including the port today according to the government news agency.
Aden, declared by the government to be the temporary capital, has seen growing unrest between Al-Qaeda in the Arabian Peninsula, long active in Yemen, and IS as both groups appear to be vying for influence.
Backed by a Saudi-led coalition, loyalists have regained control of Aden and four nearby provinces in the south since July as fierce fighting persists across the country.