The Meteorology Department predicted Wednesday temperatures will drop by eight degrees Celsius across much of the country over the next three days after a strong high pressure zone from China reaches upper Thailand tonight.
During that time, the upper part of the country will experience cool to cold weather with strong winds in some areas.
Temperatures in the North will drop between six and eight degrees, according to the weather forecast issued on Wednesday evening.
The North, the Central and the East will initially face thunder showers and afterwards temperatures will decrease by four to eight degrees.
The department warned people to take care of their health due to the weather change.
Meanwhile, a northeast monsoon that prevails over the Gulf and the South of Thailand will intensify. Strong winds and waves 2-3 metres high are likely from Chumphon and further south.
The weather officials warned that people living in coastal areas should be aware of inshore surf. All vessels should proceed with caution and small boats must keep ashore during Feb 24-27.