The greenback rose 0.14% from Friday to around VND27,455 at unofficial exchange points. Vietcombank kept its exchange rate unchanged at VND26,408.
The State Bank of Vietnam kept its reference rate steady at VND25,151.
Globally, the U.S. dollar slipped on Friday but held within recent ranges against major currencies as traders awaited next week's Federal Reserve meeting, where policymakers are widely expected to cut interest rates, Reuters reported.
The dollar index, which measures the currency against six peers, was down 0.1% at 98.994, not far from Thursday's five-week low of 98.765. For the week, the index was down 0.5%.
The euro was about flat at $1.16433, not far from Thursday's three-week high of $1.1681. Sterling was about flat on the day at $1.3329, not far from the previous session's six-week peak of $1.3385.
The yen, which has been supported in recent sessions by expectations that the Bank of Japan could raise rates this month, edged up on Friday, rising 0.1% to 155.295 to the dollar.
"This week, some soft labor market data releases from alternative sources helped crystallize what still appears to be an overdone 90% probability of a cut next week," Antonio Ruggiero, FX & macro strategist at Convera, said. "The dollar also continues to look overvalued relative to major peers, with the softer tone therefore fully justified."