Rapid changes in weather, thundershowers, heavy rains and gusts have been forecast for 36 provinces from September 22-26 by the Thailand Meteorological Department on Sunday (September 22).
The department attributed the weather conditions to a monsoon trough sitting over the Central, the East and the lower Northeast and a low pressure system over the South China Sea, while a moderate high-pressure system from China hung over the Northeast and the lower North.
The department said the sharp fall in temperature from Monday to Thursday would be caused by a moderate high-pressure system from China.

Residents of these areas should be cautious about weather fluctuations and take regular care of their health, the department said.
The affected areas are as follows:
Sunday (September 22): thundershowers, heavy to very heavy rains, winds and strong gusts.
Northeast: Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket and Ubon Ratchathani provinces.
Central: Ratchaburi, Kanchanaburi, Samut Songkhram, Samut Sakhon, Nakhon Pathom, Suphan Buri, Uthai Thani, Chai Nat, Ang Thong, Sing Buri, Lop Buri, Saraburi and Phra Nakhon Si Ayutthaya including Bangkok and its vicinity.
East: Nakhon Nayok, Prachin Buri, Sa Kaeo, Chachoengsao, Chon Buri, Rayong, Chanthaburi and Trat.
South: Phetchaburi, Prachuap Khiri Khan, Chumphon and Ranong provinces.