As millions of air-conditioners go full blast, a total fire ban is in place with temperatures soaring across the state.

Penrith hit 43.4 degrees with the CBD sitting at a slightly cooler 30.

7 News Meteorologist David Brown joins Michael McLaren to let us know if we can expect some relief from this sweating heat.

“Most of Sydney exceed 41 degrees today.

“That cool change is on the way. It should arrive in Sydney around 2am.”

Listen to the full interview below