Thailand's finance ministry has cut its 2019 economic growth forecast to 3.0% from the 3.8% it projected in April, due to falling exports.
The ministry also said it changed its 2019 estimate for exports, a key driver of growth, to a fall of 0.9% instead of a 3.4% rise.
However, the economy will be helped by a $10 billion stimulus package approved by the cabinet on Tuesday, it said.
The outlook downgrade came a day after Thailand reported second-quarter growth of 2.3%, the weakest annual pace in nearly five years.
Southeast Asia's second-largest economy expanded 4.1% last year, the best in six years.