A Russian couple and nine migrant workers from neighbouring Myanmar were among 13 people killed in a mudslide on the southern island of Phuket, officials said after the rain lashed a dozen provinces last week.
Prime Minister Paetongtarn Shinawatra handed out food supplies to people during weekend visits to their homes in the northern area of Nan.
Rescuers were battling to pull three workers from debris after a tunnel collapsed at a Thai-China railway construction project in the northeastern province of Nakhon Ratchasima, the transport ministry said.
Severe flooding persists in five northern provinces, such as Chiang Rai, Sukhothai and Prae, while there is a high risk of waters rising in areas near the Chao Phraya River, including the capital, Bangkok, though levels are still manageable.