Main Roads has issued the warning along with advice for motorists this morning.
The fog is expected to be worst between Thomas Road and Mortimer Road in both directions.
Motorists are urged to turn on headlights and keep a safe breaking distance between other cars.
Extra travel time should also be taking into account due to reduced visibility.
Stolen Ford Mustang linked to southern suburbs incidents
Mandurah Detectives are investigating a series of incidents across the southern suburbs which are believed to be linked.
Baldivis: Truck fire forces closure of Kwinana Freeway
The Kwinana Freeway northbound has reopened following a truck fire in Baldivis.
Concerns for missing Baldivis girl
Police hold urgent welfare concerns for a 13-year-old Baldivis girl.
MARC leisure pool, pirate playground to close for several weeks due to maintenance works
The indoor leisure pool and pirate playground at the Mandurah Aquatic and Recreation Centre (MARC) are set to close for several weeks due to "essential maintenance works".
Petition launched to change new Eastern Foreshore playground due to safety concerns
An online petition to improve Mandurah's new nature-based Eastern Foreshore playground is gaining traction.
Parts of Pinjarra, Fairbridge without power
UPDATE: Western Power has restored electricity.
Bouvard scrub fire deemed suspicious
A scrub fire in Bouvard over the weekend has been deemed suspicious.
Peel Thunder crush Perth in WAFLW season opener
The Peel Thunder women have crushed Perth by 50-points in their first game of the 2025 WAFLW season.
Baldivis man charged after AFP seize haul of cigarettes, vapes, $2.6M cash
A 26-year-old Baldivis man has been charged after AFP officers allegedly seized $2.6 million in cash along with illegal tobacco and vaping products across Perth.
