The mountaintops remain cold to very cold. People should take care of their health due to the variable weather, the department said.
A strong northeast monsoon prevails over the Gulf and the South. Isolated heavy rain is forecast in the lower South. People in the South should beware of the severe conditions, the department said. Strong winds and waves are likely in the upper Gulf, rising about two metres, 2-3 metres in the lower Gulf and above three metres during thundershowers.
All ships should proceed with caution and small boats in the Gulf should stay ashore until December 23, the department said. Tropical storm “Krovanh” over the middle South China Sea is expected to downgrade on December 23-24.
The forecast for the next 24 hours:
Bangkok Metropolis and its vicinity: Cool with strong winds and a 1-2 degrees Celsius drop in temperature; minimum temperature 18-20°C, maximum 28-30°C; northeasterly winds 10-30 kilometres per hour (kph).
North: Cool to cold and 2-3°C drop in temperature; minimum temperature 13-17°C, maximum 24-32°C; Cold to very cold on mountaintops and frost in some places with minimum temperature 3-14°C; northeasterly winds 10-20kph.
Northeast: Cool to cold with strong winds and 1-3°C drop in temperature; minimum temperature 10-14°C, maximum 24-26°C; cold on the mountaintop with minimum temperature 8-12°C; northeasterly winds 10-30kph.
Central: Cool with strong winds and 1-2°C drop in temperature; minimum temperature 17-18°C, maximum 27-31°C; northeasterly winds 10-30kph.
East: Cool with strong winds and 1-2°C drop in temperature; minimum temperature 16-21°C, maximum 30-33°C; northeasterly winds 20-35kph; waves about two metres high.
South (east coast): Cloudy with scattered thundershowers and isolated heavy rain; minimum temperature 19-24°C, maximum 28-32°C.
Surat Thani northwards: Northeasterly winds 20-35kph; waves about two metres high and above two metres during thundershowers.
Nakhon Si Thammarat southwards: Northeasterly winds 20-40kph; waves 2-3 metres high and above three metres in thundershowers.
South (west coast): Cloudy with isolated thundershowers; minimum temperature 22-24°C, maximum 27-31°C; northeasterly winds 20-35kph; waves about two metres high and above two metres offshore.