The index, a gauge of manufacturing activity in Africa's most industrialised economy, rose to 57.8 points in May from 56.2 points in April, remaining above the 50-point mark that separates expansion from contraction.
Four of the five subcomponents in the index were above the 50-point mark, with only the employment index dipping back into negative terrain, Absa said.
The new sales orders index reversed last month's loss, rising to 60.5, despite a dip in export sales. Absa said the increase was likely down to higher demand locally.
The bank said recent sharp increase in confirmed Covid-19 cases, which saw the country implement tighter lockdown measures on Sunday, and nationwide power outages, would likely restrain manufacturing in coming months, however.
"Even though government has to date adopted a softer touch to lockdown restrictions, a renewed virus-induced change in spending behaviour by consumers and firms could still hinder domestic demand," Absa said in the release.
"The ever-present possibility of disruptive load-shedding likely also remains top of mind for many producers."
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