A weather warning is now in place for Thursday across Victoria.

Damaging northerly winds, which will average 60 to 70km/h are expected to develop.

It will follow a tough day of excessive heat, with temperatures expected to hit 39 degrees in Melbourne alone.

Isolated thunderstorms are likely to follow and winds could hit 100km/h.

Locations which may be affected include Bendigo, Seymour, Maryborough, Ballarat, Geelong, Melbourne and Traralgon.

The State Emergency Service advises that people should:
* Check that loose items such as outdoor settings, umbrellas and trampolines are safely secured and move vehicles under cover or away from trees.
* Stay indoors and away from windows.
* If outdoors, move to a safe place indoors. Stay away from trees, drains, gutters, creeks and waterways.
* If driving conditions are dangerous, safely pull over away from trees, drains, low-lying areas and floodwater. Avoid travel if possible.
* Stay safe by avoiding dangerous hazards, such as floodwater, mud, debris, damaged roads and fallen trees.
* Stay away from fallen powerlines always assume they are live.
* Stay informed monitor weather warnings, forecasts and river levels at the Bureau of Meteorology website, and warnings through VicEmergency.