Thailand's manufacturing production index (MPI) in October dropped 4.29% from a year earlier, Industry Ministry data showed on Thursday.
The figure compared with a forecast for a 2.5% year-on-year fall for October in a Reuters poll, and followed September's 6.06% decline.
In the first ten months of this year, the index fell 5.04%, said Siripen Kiatfuengfoo, deputy director of the Office of Industrial Economics (OIE), adding that capacity utilisation was at 59.53%.
Economic recovery was slow due to lower-than-expected Chinese tourists, a major source market for the sector, she added.