The stadium gates are expected to be open at 4am.
Foreign Affairs Principal Secretary Monica Juma said more than 43 delegations — groups of people representing countries or organisations — are expected at the ceremony.
Dr Juma said she could not give the number of heads of state and government who would attend the inauguration of Mr Kenyatta and his deputy William Ruto.
Among the dignitaries expected is Prince Amyn Aga Khan, who will represent His Highness the Aga Khan.
Prince Amyn is His Highness the Aga Khan’s personal representative to Kenya and is also in the country for meetings of the Tourism Promotion Services, which operates the Serena Group of hotels, lodges and resorts.