Western Australia's rental affordability has improved over the June quarter this year as the proportion of family income required to meet the median rent declined, a report by the Real Estate Institute of Australia showed.

The state's rental affordability could boost the number of tenants looking for a place to live in, particularly in the coastal areas, said Real Estate Institute of Western Australia (REIWA) president Damian Collins.

"With coastal suburbs in high demand leading into warmer months, it is pleasing to see that it is now even more affordable to live in these desired locations, especially compared to the east coast which is unheard of for tenants to be able to rent a house in a coastal suburb for less than $450 per week," he said.

Data from REIWA showed the top 10 most affordable coastal suburbs with rents lower than $300 per week. Topping the list is Shoalwater, with a median rent of $250 per week.

Six suburbs were located in the south of Perth, within a few kilometres from one another. Collins said the south metropolitan area is perfect for those who wanted to enjoy the best of both worlds — living close to the coast while being only a train ride away from the city.

"It won't always be this way, so I advise those looking for their next rental property to act sooner rather than later if they are wanting to secure an affordable home close to an iconic WA coastal suburb," he said.

The table below shows the top 10 most affordable coastal suburbs to rent and their respective median weekly rent: