Heavy rain resulting from former Storm Nongfa caused flooding in five northern provinces, affecting more than 5,000 people.
The Department of Disaster Prevention and Mitigation reported on Sunday morning that flooding had affected around 5,450 people in Chiang Mai, Mae Hong Son, Phitsanulok and Sukhothai provinces.
Later reports confirmed severe flooding in Phetchabun, another northern province.
In Phetchabun, the Pasak River overflowed after continuous rain through Saturday night, following Storm Nongfa.
Rescue workers were deployed to evacuate children, the elderly and bedridden patients to safe areas. The flooding affected about 500 households.
In Phitsanulok, run-off from the Phetchabun mountain range swept through houses, leaving hundreds of residents in difficulty.
On Sunday morning, the Meteorological Department warned that a low-pressure system would continue to bring increased rainfall across Thailand on Sunday and Monday.