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"A weak southwest monsoon prevails over the Andaman Sea, Thailand and the Gulf of Thailand," the department said.
"The monsoon trough will lie across Myanmar and Laos and as a low pressure cell over upper Vietnam."
Strong winds are expected in the Andaman Sea and the Gulf, with waves about two metres high in the Andaman Sea, 1-2 metres high in the Gulf and above three metres during thundershowers, the department added.
The weather forecast for the next 24 hours:
North: Scattered thundershowers with isolated heavy rains in Mae Hong Son, Chiang Mai, Chiang Rai, Phayao, Nan, Tak, Kamphaeng Phet, Phichit, Phitsanulok and Phetchabun provinces; minimum temperature 24-25 degrees Celsius, maximum 33-36°C; southwesterly winds 10-20 km/hr.
Northeast: Scattered thundershowers with isolated heavy rains in Loei, Nong Khai, Bueng Kan, Udon Thani, Sakon Nakhon, Nakhon Phanom, Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket and Ubon Ratchathani provinces; minimum temperature 24-25°C, maximum 33-35°C; southwesterly winds 10-15 km/hr.
Central: Scattered thundershowers with isolated heavy rains in Kanchanaburi, Ratchaburi, Samut Songkhram, Chainat, Uthai Thani, Nakhon Sawan, Lop Buri and Saraburi provinces; minimum temperature 24-26°C, maximum 32-35°C; southwesterly winds 10-20 km/hr.
East: Scattered thundershowers with isolated heavy rains in Nakhon Nayok, Prachin Buri, Sa Kaew, Chachoengsao, Chonburi, Rayong, Chanthaburi and Trat provinces; minimum temperature 23-26°C, maximum 31-34°C; southwesterly winds 15-35 km/hr; Waves 1-2 metres high and about two metres in thundershowers.
South (east coast): Scattered thundershowers mostly in Phetchaburi, Prachuap Khiri Khan and Chumphon provinces; minimum temperature 22-26°C, maximum 31-35°C; southwesterly winds 15-35 km/hr; waves 1-2 metres high and about two metres in thundershowers.
South (west coast): Isolated thundershowers mostly in Ranong and Phang Nga provinces; minimum temperature 21-25°C; maximum 33-35°C; southwesterly winds 20-35 km/hr; waves about two metres high and about three metres during thundershowers.
Bangkok and surrounding areas: Scattered thundershowers; minimum temperature 26-28°C, maximum 32-34 °C; southwesterly winds 10-20 km/hr.