The inauguration ceremony opened at the Parliament building in Tehran on Saturday with delegates from more than 100 countries, including several heads of state, partaking in it.
Iranian Parliament Speaker Ali Larijani and Judiciary chief Ayatollah Sadeq Amoli Larijani were scheduled to give separate speeches at the ceremony. Rouhani will then take the oath of office.
Rouhani won re-election in a landslide victory in May after securing 57 percent of the votes and defeating his main contender Ebrahim Raeisi, the current custodian of the Holy Shrine of Imam Reza (PBUH).
On Thursday, Leader of the Islamic Revolution Ayatollah Seyyed Ali Khamenei formally endorsed Rouhani as president for the second term.