The three-day poll, which closed on Monday, surveyed 1,023 US adults nationwide and had a margin of error of 3 percentage points. It showed a nation deeply polarized over Trump, with 83% of Republicans and just 3% of Democrats approving of his performance. About one-third of independents approved.
Trump had a 41% approval rating in Reuters/Ipsos' most recent prior poll, conducted on July 15 and 16.
The Republican campaigned on promises to supercharge the US economy and crack down on immigration, and the poll found that Americans gave him mixed marks on both those areas, where his administration is using aggressive tactics.
Some 38% of respondents approved of Trump's handling of the economy, up from 35% approval in the mid-July poll. His numbers were also up slightly on immigration, with 43% of respondents approving, compared with 41% in the earlier poll.
All the shifts were within the poll's margin of error.