The announcement was made Monday by Tourism and Sports Minister Sorawong Thienthong and deputy government spokeswoman Sasikarn Watthanachan.
Sorawong said the upgrade would significantly boost confidence among international tourists, especially American travelers, who are often regarded as high spenders.
He added that the improved rating is expected to benefit the tourism sector by increasing revenue for hotels, restaurants, and local businesses across the country.
Thailand received 14.36 million foreign tourists in the first five months of 2025, marking a 2.7% decline compared to last year.
Concerns over tourist safety in Thailand have grown in recent months, particularly after the kidnapping of Chinese actor Xing Xing in January.