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Motorists in upper Thailand should proceed with caution due to poor visibility, the department said.
Meanwhile, the weakening northeast monsoon over the Gulf and the South results in less rain over the South.
The department also said that from December 30 to January 3, the strong high pressure from China will extend to cover upper Thailand. Cool to cold weather will be likely over upper Thailand with a 4-6 degrees Celsius drop in temperature and strong winds.
The weather forecast for the next 24 hours:
North: Cool weather with fog in the morning and dense fog in some areas; minimum temperature 16-22 degrees Celsius, maximum 31-36°C; temperature on hilltops is likely to drop to 6-13°C.
Northeast: Cool weather with fog in the morning and dense fog in some areas; minimum temperature 18-23°C, maximum 34-35°C; temperature on hilltops is likely to drop to 12-16°C.
Central: Fog in the morning and dense fog in some areas; minimum temperature 23-25°C, maximum 35-37°C.
East: Partly cloudy with fog in the morning; minimum temperature 24-26°C, maximum 32-36°C; waves 1-2 metres high and two metres off shore.
South (east coast): Partly cloudy with thundershowers in 20 per cent of the areas; minimum temperature 23-24°C, maximum 31-33°C; waves 1-2 metres high and two metres during thundershowers.
South (west coast): Partly cloudy with thundershowers in 10 per cent of the areas; minimum temperature 22-26°C, maximum 31-34°C; waves a metre high and 1-2 metres during thundershowers.
Bangkok and surrounding areas: Fog in the morning; minimum temperature 25-27°C, maximum 33-36°C.