Thailand's headline inflation rate in September 2026 accelerated to 2.82% year-on-year, the highest level in five months, driven mainly by an energy price index that rose 10.5% year-on-year. Cost pass-through has become more limited amid weak purchasing power. Kasikorn Research Center maintains its forecast for Thailand's headline inflation at 1.8% in 2026 and expects inflation to accelerate in the fourth quarter from the 1.5% year-on-year increase recorded over the first nine months of the year, due to energy prices that are expected to remain elevated and agricultural and food prices that are trending higher.