About 150 firefighters are continuing to battle an uncontrolled blaze near Meelon in the Shire of Harvey, south of Perth, which authorises have deemed suspicious.

The Department of Fire and Emergency Services (DFES) said the blaze was currently stationary, but was unpredictable and an emergency warning remained in place.

The warning currently in place is for people in Meelon including people south of Pinjarra-Williams Road, east of Nicholson Road, north of Madison Road and bounded by Scarp Road to the east.

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The warning also covers the Murray Hills Estate.

DFES said homes in Coolup Road East, Ridgeview Drive and Valley View Road remained under immediate threat.

A temporary evacuation centre has been opened at the Murray Leisure Centre in Pinjarra.

Firefighters have managed to save many homes and sheds in the area DFES said.

Water has been restored to the nearby town of Dwellingup after the supply was cut on Monday, although some areas of the town are without power due to infrastructure damage.

A bushfire watch and act is in place for people north of Pinjarra-Williams Road, east of Nicholson Road, south of Napier Road and west of Scarp Road.

There is a possible threat to lives and homes in the area and residents are urged to get ready to leave or actively defends their properties.

Authorities said the fire was suspicious and the police arson squad was investigating.

The blaze has burnt through more than 1,250 hectares of land.