It warned people in these areas to beware of severe conditions.
Here’s the weather forecast for the next 24 hours:
North: Mostly cloudy with thundershowers in 60 per cent of the area and isolated heavy rains; temperature lows of 24-27 degrees Celsius and highs of 39-35°C.
Northeast: Mostly cloudy with thundershowers in 60 per cent of the area; temperature lows of 24-26°C and highs of 33-35°C.
Central: Mostly cloudy with thundershowers in 60 per cent of the area and isolated heavy rains; temperature lows of 24-26°C, highs of 31-35°C.
East: Mostly cloudy with thundershowers in 60 per cent of the area; temperature lows of 25-27°C, highs of 32-35°C; waves a metre high and 1-2 metres during thundershowers.
South (east coast): Mostly cloudy with thundershowers in 60 per cent of the area and isolated heavy rains; temperature lows of 23-26°C, highs of 32-34°C; waves a metre high and 1-2 metres during thundershowers.
South (west coast): Mostly cloudy with thundershowers in 60 per cent of the area and isolated heavy rains; temperature lows of 23-26°C, highs of 32-34°C; waves a metre high and 1-2 metres during thundershowers.
Bangkok and surrounding areas: Mostly cloudy with thundershowers in 60 per cent of the area; temperature lows of 26-27°C, highs of 33-34°C.