Bathers are being asked to forego a Christmas tradition this year and stay away from the 40 Foot, Sandycove and Seapoint.
Dun Laoghaire-Rathdown County Council, gardai and the HSE have issued a joint statement warning of the potential spread of Covid-19 at public gatherings.
A council spokesperson said: “We are appealing to the public to consider their wider communities and to please refrain from visiting these bathing areas this Christmas Day and St Stephen’s Day.
“We would not be asking this if we did not consider that a large gathering would create a potential risk to public health and the spread of COVID-19. It is only for this year and is being advised in the spirit of ensuring the safety of all our families and friends.
“Dún Laoghaire-Rathdown has many fine public spaces and so for this year please consider visiting one of the many parks across the county and look forward to a swim on another day over the festive period.”
In response Fine Gael TD Jennifer Carroll McNeill said there would be no Christmas Day swim for herself or Tanaiste Leo Varadkar this year – “dry robe or no dry robe”.
She said: “I was delighted to join the Tánaiste Leo Varadkar and Senator Barry Ward for a swim at the Forty Foot last Christmas Day, but I’m going to have to ask the Tánaiste to avoid braving the elements for just this year.
“I urge people to consider doing their dip on a different day, or maybe find a quieter spot, make sure that you remember to keep your distance and avoid large gatherings and lingering around for a cup of coffee afterwards.”
