Thought Sunday night was warm? Tonight is going to be sweltering.

Melburnians can expect the mercury to still be hovering about 30 degrees when they turn in.

A warm sunset at St Kilda on Sunday night. Credit:Leigh Henningham

A cool change won't arrive in until after midnight, bringing much-needed relief for restless sleepers.

The Bureau of Meteorology has forecast a top of 35 on Monday with scattered clouds. There is a slim chance of rain during the day, although it will only be a sprinkle at most, senior forecaster Scott Williams said.