The temperature is expected to drop 1-2 degrees Celsius. The mountaintops will be cold to very cold with frost in some areas.
Meanwhile, the moderate northeast monsoon prevailing across the Gulf and the South brings isolated thundershowers to the South. Waves in the Gulf are expected to rise about two metres high and over two metres high during thundershowers. All ships should proceed with caution and keep off thundershowers, the department said.
The weather forecast for the next 24 hours:
North: Cold weather; minimum temperature 13-17 degrees Celsius, maximum 28-31°C; temperature on hilltops likely to drop to 3-13°C with frost in some areas.
Northeast: Cool to cold weather with strong winds; minimum temperature 13-18°C, maximum 27-30°C; temperature on hilltops is likely to drop to 7-13°C.
Central: Cool weather in the morning; minimum temperature 17-20°C, maximum 29-31°C.
East: Cool weather in the morning with strong winds; minimum temperature 17-22°C, maximum 30-32°C; waves a metre high and 1-2 metres off shore.
South (east coast): Partly cloudy with thundershowers in 10 per cent of the areas; minimum temperature 22-26°C, maximum 30-31°C; waves two metres high and over two metres during thundershowers.
South (west coast): Partly cloudy with thundershowers in 10 per cent of the areas; minimum temperature 22-25°C, maximum 32-33°C; waves a metre high and two metres during thundershowers.
Bangkok and surrounding areas: Cool weather in the morning with strong winds; minimum temperature 20-21°C, maximum 29-31°C.