Five districts of the southern province of Phangnga have been declared disaster areas after they were hit by flash floods caused by the southwest monsoon covering the Andaman Sea.
Hard hit were 76 villages of 22 tambons in Ta Kua Pa, Kapong, Thai Muang, Ta Kua Thung and Thap Put districts.
More than 500 households with about 1,200 people have been affected, a number of small fishing boats swept away, livestock drowned, and fish ponds and farmland inundated.
Public facilities including government offices, roads, bridges and waterworks were damaged.
Many areas had very heavy raiin, with 142 millimetres recorded at one reporting station. Water in some canals was over 7 metres deep.
The mudslides and flash floods were believed to have been caused by extensive distruction of forests in protected areas by encroachers for rubber and oil palm plantations.
In the Northeast, continuous rain along the Thai-Cambodian border sent runoff from Phu Salao and Khao Banthat mountains flooding into Khun Han district of Si Sa Ket province.
Water in Huay Chan stream overflowed into villages and rice fields along its banks.
Bin Sisan, village chief of Ban Huay Chan, used loudspeakers to prohibit villagers and visitors playing in the water around Huay Chan waterfall.
The road between Ban Huay Chan and Ban Tachu and a bridge had been flooded and was impassable.
People in at least 200 households were unable to take farm products such as rambutan and durian to the markets.
In the North, at least six villages in tambon Khlong Lan Patthana in Khlong Lan district of Kamphaeng Phet province were left flooded after more than four hours of rain on Wednesday night.
A 200-metre stretch of Highway 1117 between Khlong Lan and Mae Wong National Park was about 20cm underwater.