The consumer price index (CPI), a gauge of headline inflation, dropped 0.98% year-on-year in July, the fifth straight month of decline.
But the rate slowed from -1.57% in June, -3.44% in May (the biggest drop in nearly 11 years) and -2.99% in April. The March reading of -0.54% marked the first contraction in 33 months.
Pimchanok Vonkorpon, director-general of the Trade Policy and Strategy Office, said key contributors to the July figures were a slower contraction of energy prices, the first rise in raw food prices in three months as domestic demand spiked with students returning to school, a recovery of economic activity and an outbreak of African swine fever in neighbouring countries.
The termination of subsidised utility bills and a decrease in promotional activities also played a part in the drop.
According to the Commerce Ministry, inflation for items excluding food and energy, known as core inflation, was 0.39% year-on-year in July.
For the first seven months of 2020, headline inflation averaged -1.11% and core inflation averaged 0.34%.
"With the easing of the Covid-19 situation, government measures to promote domestic tourism and stable energy prices, we expect a better [i.e., higher] inflation rate for this month," Ms Pimchanok said. "However, a second wave of the coronavirus, fluctuating energy prices and the global economic situation are risk factors that warrant close monitoring."
In July, the Commerce Ministry downgraded its annual headline inflation forecast to a range of -0.7% to -1.5%, with an average of -1.1%, from a range of -0.2% to -1.0%, an average of -0.6%, expected after the rate dropped for the fourth month in a row in June.
The forecast assumes GDP will contract by 7.6%-8.6% this year, with Dubai crude oil prices averaging US$35-45 a barrel and an exchange rate of 30.50-32.50 baht to the US dollar.
Thanavath Phonvichai, president of the University of the Thai Chamber of Commerce, said the CPI's drop at a slower pace is in line with the economic trend, which is likely to bottom out in the second quarter.