MAINLAND beaches from Port Douglas to South Mission Beach will likely remain closed this weekend until further notice, with lifeguards urging swimmers to stay out of the water because of increased stinger activity.

The warning comes after three people were taken to hospital for jellyfish stings on Thursday.

North Queensland lifeguard supervisor Jay March said weather conditions were ideal for stingers, with a number of irukandji already caught by beach nets in routine drags.

"Unfortunately, it’s very inviting," Mr March said.

"We need a change in the weather before we go changing (our opening times)."

Mr March said swimmers instead should seek out watering holes across the Far North.

However, lifeguards will still be on patrol at all major beaches, with only Green Island still open from 9.15am and 4pm daily.

Mr March said most tourism resorts and backpacker hostels had been kept up to date on the latest developments.

"Obviously, we’re trying to keep everyone as safe as we can," he said.

Lifeguards will make daily assessments whether to reopen the beaches.

With beaches closed, increasing numbers have been flocking to the Cairns Lagoon.

Adhering to the warnings, Redlynch mum of two Shay Latimer said she much preferred swimming in the safety of popular waterhole The Rocks picnic area, far from threat of jellyfish.

"It’s always cool, shady and fun for the kids," Ms Latimer said.

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