Strong wings are also likely.
Temperatures in the Central and East regions, including Greater Bangkok, will fall by 3 to 5 degrees Celsius.
The meteorological department also said the northeast monsoon across the Gulf of Thailand and the Andaman Sea will intensify over the next few days. As a result, some areas of the South will see heavy rain. Flashfloods are a danger, it warned.
Waves in both the Gulf of Thailand and the Andaman Sea are forecast to rise to between 2 and 4 metres. They will surpass 4 metres during thundershowers, the department said. It urged coastal residents to prepare for surges. Ships should proceed with caution and small boats should remain on short, the department said.