The leu closed at 4.5225/4.5245 to the euro, from 4.528/4.53 to the euro at Friday closing.
The local currency opened flat and stayed around the opening levels in the first hour of trading, but it later gained ground towards 4.52 per euro by mid-day.
Romania’s central bank set the leu’s exchange rate at 4.5209 per euro, the strongest since October 1.
On the money market, overnight rates were flat at 5%-5.5% a year.