Inflation in the first eight months was 3.72 per cent, higher than the ministry's annualised target of 3.7 percent.
However, Commerce Ministry permanent secretary Yanyong Phuangrach said inflation should drop in the fourth quarter and the annualised target should be met.
Core inflation in August was 2.85 per cent year on year and 0.27 per cent month on month.
Core inflation, excluding volatile food and fuel prices, in the first eight months was 2.12 per cent year on year.
It is well within the Bank of Thailand's target of 0.5-3 per cent.