One of WA's peak country bodies has urged families to get behind the Perth Royal Show as it faces a third consecutive multi-million-dollar loss as visitor numbers dwindle.

Revenue and attendance at the iconic event have been on the decline since 2015, when the state government pulled the plug on funding free entry for children under 12 years old.

This Royal Show patron struggled with the 2017 weather.

Visitor numbers in 2016 dropped to 311,000 – 25 per cent less than two years prior when more than 410,000 people flowed through the show's gates "despite heavy rain over opening weekend", the Royal Agricultural Society of WA's 2015 annual report said.

Wet weather has hampered this year's attendance. WAtoday understands some stall operators have been forced to cut staffing for the remaining four days.