Meteorological Department warned on Monday morning.
According to its forecast, another moderate high-pressure system from China over southern China will reach the Northeast of Thailand and the South China Sea at night on Monday.
Meanwhile the southerly and southeasterly winds bring humidity from the Gulf of Thailand and the South China Sea to the lower North, the Northeast, the Central and the East regions. Summer thunderstorms are possible in the upper country, accompanied by hail, gusty winds and thunderbolts.
Affected areas will be as follows:
On Monday:
Northeast: Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket and Ubon Ratchathani
East: Prachinburi, Sa Kaeo, Chachoengsao, Chonburi, Rayong, Chanthaburi and Trat.
On March 2-3:
North: Uttaradit, Sukhothai, Phitsanulok, Kamphaengphet, Phichit, Phetchabun and Tak.
Northeast: Chaiyaphum, Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket and Ubon Ratchathani
Central: Nakhon Sawan, Lop Buri, Saraburi, Uthai Thani, Chainat, Phra Nakhon Si Ayutthaya, Suphan Buri, Kanchanaburi, Ratchaburi including Bangkok and its vicinity.
East: Nakhon Nayok, Prachinburi, Sa Kaeo, Chachoengsao, Chon Buri, Rayong, Chanthaburi and Trat.
South: Phetchaburi Prachuap Khiri Khan and Chumphon
March 4
North: Sukhothai, Phitsanulok, Kamphaengphet, Phichit, Phetchabun and Tak.
Northeast: Chaiyaphum, Nakhon Ratchasima and Buri Ram.
Central: Uthai Thani, Suphan Buri, Kanchanaburi and Ratchaburi.
East: Nakhon Nayok, Prachin Buri, Sa Kaeo, Chanthaburi and Trat.