The government's "Vigicrues" flood monitoring body showed a slight increase overnight in the levels of the river in the capital, which could get close to peaks last seen in 2016.
The Seine's overflowing waters have already engulfed riverside walkways in Paris and led the Louvre museum to close a basement display of Islamic art.
It has also resulted in the famous "Bateaux Mouches" tourist boats being shut down due to the high waters, swans swimming in places where there are usually pavements, and even rats being forced onto the streets of Paris due to the flood.
Flooding caused destruction in Paris in 1910 when the Seine rose by 8.65 metres.