Voting in about 140 polling stations will be voting on Wednesday 24 hours after the stipulated voting period with the Electoral Commission of Zambia (ECZ) saying logistical challenges delayed the process.
Earlier the opposition had raised the call that some areas where they held strong ground had been deliberately disadvantaged but the ECZ has said that the weather had made the areas inaccessible.
The ECZ has also confirmed that they had received a complaint from the UPND that the Zambia Air Force had refused them permission to use the airspace fly some of their observers after agreeing to the request.
Addressing a late media briefing on Tuesday ECZ director Priscilla Isaacs said that the voters in the affected would be allowed to cast their votes on Wednesday as they could not be denied their fundamental right.
She named some of the affected areas as Mitete, Lukulu, Mwansabombwe, Liuwa, Senanga, Samfya, Mungwi, Luano, Petauke, Chama (North and South) with the number of polling stations varying.
Isaacs said that some materials had been delivered during the course of the day while some affected areas may have to wait until tomorrow to cast their votes.
She said that the ECZ was still targeting having all the results on time by 23rd January.
Results have started trickling in so far but it is too early to draw a consistent pattern.
Isaacs has described the outcome as fair.
Most parts of the country voted under heavily rainy conditions.