The Central and East regions including Bangkok and its vicinity will also see the temperature dropping by 1-2 degrees. More rain is expected in the south and wave height in the Gulf of Thailand of about 2 metres.
The weather forecast for the next 24 hours is as follows:
Northern region: Cool to cold with fog in the morning, lows of 13-19 degrees and highs of 30-36 degrees Celsius. Temperature likely to drop to 5-10 degrees on hilltops with frost in some areas.
Northeastern region: Cold with fog in the morning with isolated rain, lows 16-20 degrees and highs of 32-33 degrees Celsius. Temperature likely to drop to 9-13 degrees on hilltops.
Central region: Partly cloudy with fog in the morning; lows of 21-22 degrees, highs 33-35 degrees Celsius.
Eastern region: Partly cloudy with fog in the morning and isolated rain; lows 20-24 degrees, highs 32-34 degree Celsius; wave height 1 metre.
Southern region (east coast): Partly cloudy with thunder showers in 10 per cent of the area; lows 21-24 degrees, high 31-34 degrees Celsius; wave height 1 metre.
Southern region (west coast): Partly cloudy with thunder showers in 10 per cent of the area; lows 22-24 degrees, highs 32-34 degree Celsius; wave height 1 metre, increasing to 1-2 metres during storms.
Bangkok and surrounding area: Partly cloudy and fog in the morning; lows 23-25 degrees, highs 33-35 degrees Celsius.