Rowhani will become president once supreme leader Ayatollah Ali Khamenei, the ultimate decision-maker in the Islamic republic, formally endorses his surprise June election.

That ceremony, attended by top officials, will take place on August 3, deputy speaker Mohammad Reza Bahonar said in remarks reported by the state broadcaster's website.

A day later, on August 4, Rowhani will take the oath of office before parliament and will then have two weeks to form his proposed cabinet, Bahonar said.

Lawmakers will then validate his ministers over a 10-day period.

Rowhani won more than 18.5 million votes, or 50.7 percent of total ballots cast in last month's election, overwhelmingly sweeping aside his conservative rivals. (AFP)