Yingluck called on the protesters to maintain peace during protests and promised that the government would fully carry out its obligations but cautioned that violence is sometimes the work of a third party and is a concern.
A few schools have declared a holiday on Monday while many households have stocked up on dry food.
The anti-government protesters have vowed to continue their protests and want Yingluck to quit even as caretaker prime minister after she dissolved parliament last month and called for snap polls on February 2.
Meanwhile, police Lt-General Sophon Pisutwong, who is in charge of the operations in relation to the "Bangkok shutdown", warned that some of the 27 missing police guns and ammunition might be used to incite violence on Monday.
More From This Section
Sophon said the weapons - six shotguns that riot-control police used to fire rubber bullets with, 12 teargas launchers, three .38 pistols as well as six police personnel pistols - had gone missing from police trucks during the December 26 clash between anti-government protesters and police force at a sports Stadium here.
The opposition Democrat Party, which has not won general elections in two decades, wants Yingluck to step down and does not want her brother, controversial former premier Thaksin Shinawatra, to be involved in politics.
Yingluck called the snap polls after intense pressure from protesters vowing to rid the country of Thaksin's alleged proxy influence.
Thaksin is in Dubai in self-exile after being ousted in a 2006 coup while Yingluck's government still enjoys strong support in the north and northeast of the country.
Protesters plan to occupy Bangkok from January 13 and have vowed to prevent government officials from working. They say power and water supply to official buildings would be cut off.