The new forecast is slightly above the bank's 1.5-3.5 percent target, but sharply lower than the 5 percent annual inflation figure recorded in March, the highest in the region.
Inflation has been heightened by higher energy and fuels prices and consumption-friendly wage hikes in the import-reliant European Union member state.
Bank governor Mugur Isarescu said that while April inflation will surge because of higher tobacco excise duties, price growth will then linger at around 5 percent until the start of October.
The bank expects inflation to slow down further to 3.0 percent at the end of 2019, a shade lower than its previous forecast of 3.1 percent.
Earlier this week, the bank delivered the third hike this year to its benchmark interest rate bringing it to 2.50 percent. Isarescu said the central bank planned to maintain a gap between its interest rate and the inflation rate.
The governor added that consumer confidence in Romania is on a sliding path, reflecting inflationary expectations and caution.