The annual Alcoa Children's Festival scheduled for Saturday, March 28 has been cancelled due to extreme weather.
The City of Kwinana made the announcement on Wednesday.
"This decision has been made in the interest of community safety and wellbeing," a City of Kwinana spokesperson said.
"Due to extreme weather, it is not possible to safely deliver the event, with many rides activities and marquees unable to be installed or run in high winds or extreme rain.
"The safety of our community, staff, vendors and performers is our highest priority.
"We understand this event is highly anticipated and the cancellation is disappointing for many families."

Murray House Resource Centre to close after 25 years
Police seek identity of duo wanted for questioning over Dudley Park theft
Three in custody after Pinjarra police chase
Peel Thunder coach Adam Read to lead WAFL State team for second year
Prescribed burn prompts smoke alert for Rockingham, Mandurah and surrounds
Australind local celebrates $1 million Lotto win
Four injured in Naval Base crash
Tributes flow for boy killed in scooter crash on Mandurah Terrace
Mandurah man charged over walking stick attack