Thailand's customs-based exports contracted 6.4% in June from a year earlier, the Commerce Ministry said on Wednesday.
The reading compared with a forecast for a 7.3% year-on-year drop for June in a Reuters poll, and followed May's 4.6% fall.
The Finance Ministry has lowered its 2023 economic growth outlook to 3.5% from 3.6% projected earlier, as tourism gathers strength but tepid global demand crimps exports.