We can confirm it is nothing to be grossed out by.

Bureau of Meteorology ocean analyst, Jessica Sweeney, shared some fascinating insights on what the currents have been doing along the NSW coast.

Ms Sweeney said Jervis Bay's sea surface temperature was currently 24 degrees, Sydney's was 25 to 26, and Eden was 21.5 - all warmer than average for this time of year. 

So what is causing the bath-like temperatures? 

"It is not entirely unusual," Ms Sweeney said.

Persistent north and north-easterly winds cause an effect known as "upwelling", bringing deep cooler ocean water to the surface.

However in the past week, the wind has eased, causing the upwelling to decline and warmer water to return.

"The northerlies have eased and the upwelling has gone away; the warm waters have moved back in close to the coast, causing the temperatures to jump quite suddenly," she said.

"A warm eddy has also moved in close to the coast."

Ms Sweeney said those conditions were coupled with a marine heatwave in the Tasman Sea.

"The triangle of NSW, Tasmania  and New Zealand is about two to three degrees above normal," she said

"There is a lot of heat in that region; whether you feel it on the beach or not is due to whether there is upwelling or not."

For most of January and early February, Ms Sweeney said upwelling caused cooler water temperatures along the NSW coast.

"The wind pushes the warm top layer of ocean away from the NSW coast, and the colder water from the deep ocean comes up to replace it.

"Because of the high pressure system which has dominated over the Tasman sea, there was a lot of northerly wind and a lot of colder water along the coast."

Now, the main body of heat is in the Sydney and Jervis Bay regions. Ms Sweeney said the currents were moving south and might not make it to Batemans Bay.

"On Tuesday through to Wednesday next week, northerly winds will return, bringing back the cooler  temperatures," she said.