SWIMMERS hitting the water at Mooloolaba and Noosa are likely to come across sea lice, and bluebottles could be on their way too.
Onshore winds have pushed sea lice on to the Coast's north-facing beaches, like Mooloolaba Beach and Noosa Main Beach.
Sunshine Coast lifeguard supervisor Trent Robinson said the north-easterly winds brought the sea lice, along with other things, down from the north of the state.
"We start to get a lot of the stuff from up north comes down, that's that bit of an algae bloom, that's that sort of brown patches, and in those brown patches are strong sea lice.
"We haven't had any bluebottles yet but they are probably on their way as well."
Beach goer Lulu Rose said the "hideous green algae" blown into the bay by the north-easterly winds was keeping swimmers out of the water this afternoon.
"The who sea around the beach looks like mud," she said.
The sting from sea lice was usually "light" and lasted for about five minutes, Mr Robinson said.
"Sea lice, usually it's just a little bit itchy ... and they just stick to your skin," he said.
"So the best thing is, as soon as you've got them on, wash it off in the saltwater.
"A lot of people get stung and then get out of the water straight away and it's actually still on them.
"The best thing to do is to stay in the saltwater and actually wash it off with the saltwater, then come up, wash it off in the freshwater, and maybe see your lifeguard and get some ice to put on there if it's any worse."
For beach goers wanting to avoid sea lice and the northerly winds, Kings Beach was Mr Robinson's pick for Saturday but he said noticeboards between the red and yellow flags at beaches up and down the coast would show whether or not sea lice or bluebottles were in the water.
Anyone who is stung can speak to lifeguards about treatment.