The Thai Meteorological Department (TMD) said on Friday that the cool temperatures are being brought by the strong high-pressure system from China that will extend to upper Thailand, bringing cold weather and strong wind to the areas.
From Monday to Thursday, the high-pressure system over the upper parts of Thailand will reduce and result in temperatures rising by 1-3°C, TMD said.
Meanwhile, the Northeast monsoon prevailing over the Gulf of Thailand and the South will strengthen, leading to more rain in the lower South until Thursday.
Waves in the lower Gulf and the Andaman Sea are expected to be about 2 metres high and higher during thundershowers.
People are advised to protect themselves from changing temperatures, strong winds and dry air. Ships and boats are also advised to proceed with caution.