On the same day, there will be elections for provincial legislatures across the country.
But fixing South Africa's stagnant economy may prove more complicated.
An 11-member Zanu-PF delegation is also in South Africa to observe the elections.
In spite of concerns from some stakeholders about the competence of the IEC's ad hoc staff at the local level, the AUEOM said the elections "proceeded generally well and within a conducive environment that ensured citizens exercised their right to vote".
The issue of land has been topical through the years but more prominently this year when the expropriation of land engaged lawmakers in fierce exchanges.
We are glad that the ANC is on solid ground and headed for another landslide and historic victory which will not only give it a fresh mandate but consign racist opposition parties like the DA to the dustbins of history. There is now a commission looking into high-level corruption under the Zuma administration.
If the ANC improves on its 2016 vote, Ramaphosa will have presided over the first increase in its vote for 15 years. Download BRIEFLY's news app on Google Play now and stay up-to-date with major South African news!
Forty-eight parties contested the elections - a record number.
ANA|The African National Congress (ANC) has a fight on its hands in the key provinces of Gauteng and KwaZulu-Natal where by late Thursday night it held a slim majority in each.
And Mr. Malanji has commended the people of South Africa for carrying out peaceful campaigns without reports of incidences of violence or intimidation.
There are 48 parties to choose from - more than at any election since the end of white minority rule in 1994.
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Representatives Tulsi Gabbard and Eric Swalwell are the youngest, with all three White House contenders under 40. In the above clip, Bash first asks Biden why now is the right time for her husband to run for office.
The Democratic Alliance received 22% of the vote so far, the most of any opposition party, about the same share it received in 2014. The early tallies put the ANC on 57 percent in the parliamentary race, with the main opposition Democratic Alliance (DA) on almost 23 percent and the leftist Economic Freedom Fighters (EFF) on almost 10 percent.
The African National Congress has been the ruling party of post-apartheid South Africa since the election of Nelson Mandela in 1994.
The ANC now controls eight of the country's nine provinces, with the DA in power in the Western Cape. Zuma denies any wrongdoing.
Ramaphosa clinched the party leadership in 2017 by a narrow margin.
In his address to parliamentarians during a courtesy call at the Pan African Parliament, the head of the AU Election Observer Mission to SA and former Tanzanian President Mr Jakaya Kikwete commended South Africans for competing in peace saying it should be a lesson for other African countries.
However, it should be noted that the electoral process is ongoing and there are still important stages to be concluded before an overall and conclusive assessment can be provided, the AUEOM said.
From 2000 to 2001, Marais was mayor of Cape Town Mayor between 2000 and 2001. De Lille has a strong following in the Western Cape and left the DA to form her own party, which could dent the DA's support.
"Even though we've lost some votes, we've held the centre - and I will lead that project going forward", he told reporters at the results centre.
The Inkatha Freedom Party (IFP) had 2.89 percent and Freedom Front Plus (FF+) had won 2.48 percent as the counting continued, the elections body said.
ANC Deputy Secretary General Jessie Duarte said the party was "not unhappy" with the vote share it looked set to receive, which was in line with internal forecasts.