The online poll shows 48.35 percent for Clinton to 47.48 for Trump.
Both candidates edged up slightly in the newest data compared to data collected a day earlier, though Trump has gained considerable ground on Clinton over the past seven days, the poll's full sample size.
Trump has gained 3.3 percentage points in the past week, while Clinton has lost 2.3 points, leaving the race in a virtual tie.
The UPI/CVoter online tracking poll surveys at least 200 people each day, leading to a sample size of at least 1,400 people during any seven-day span.
Because the poll is conducted online and individuals self-select to participate, a margin of error cannot be calculated. The poll has a credibility interval of 3 percentage points. This seven-day span includes data collected from Aug. 16-22, when 1,752 individuals were surveyed. Of them, 1,214 identified themselves as likely voters.