A high fire danger is forecast in Sydney and surrounding areas with temperatures expected to approach 40C in the city’s west on Monday.

Residents have been warned to be ready to act in the event of fires.

Similar danger is forecast in the state’s central west, southern ranges and north western regions.

Residents were advised to monitor conditions with a number of fires burning in Muswellbrook and other parts of the NSW Hunter region.

Heatwave warnings also remain in northern WA, northeast South Australia, and parts of northern NSW on Monday.

However conditions are expected to ease in Victoria after a searing weekend.

Victoria can expect patchy rain and showers across the state, with temperatures mostly below average on Monday after the heat prompted some total fire bans at the weekend.

A moderate risk-of-fire rating remains in place following days of extreme and high fire danger.

Firefighters battled blazes in the Central Goldfields region near Maryborough and at Moliagul, west of Bendigo, with residents in the area advised to watch and act amid attempts to bring the fires under control on Sunday afternoon.

Residents near the Moliagul fire were advised to monitor for increased or changing winds and smoke.

Authorities remain concerned about a bushfire burning in the east of the Grampians National Park since mid-December, with a watch and act warning in place.

Residents were allowed to return to their properties with caution at the weekend.

The fire is still burning but its spread has slowed, with those in the area advised to monitor conditions amid hot and windy weather.

-with AAP