Unseasonal summer storms are expected to hit many parts of the country from Thursday onward.
The Meteorological Department on Sunday issued a summer storm warning for northeastern and eastern provinces from Thursday to Saturday.
The storm then will move to the northern and central regions, including Bangkok, on Friday.
Patches of hail and strong winds are forecast in northeastern and eastern areas during the period, the weather office added.
The storm front is due to a high pressure system from China moving over the northeastern and eastern parts of the country towards the South China Sea.
Heavy rain has already hit some provinces, including Tak and Phetchabun, this weekend.
In Bangkok, rain was reported in Jomthong, Pathumwan, Ratchathewi, Phaya Thai and Din Daeng districts on Sunday by the Bangkok Metropolitan Administration, while downpours flooded several roads in Samut Prakan.
The storms will coincide with a long weekend, as Friday, April 6, is a public holiday to mark Chakri Memorial Day.
