Swimming has been banned at four more Dublin beaches for the coming days.

The news comes as a heatwave is forecast for later this week.

Met Éireann has forecast highs of 27° on Thursday and Friday.

Prohibition notices are in place for beaches at Seapoint, Sandycove, the Forty Foot and Dollymount.

This is because of heavy rainfall in the area on Sunday and Monday, which saw overflow discharges of wastewater at a number of treatment facilities and pumping stations in the bay area of south Dublin.

Dún Laoghaire-Rathdown County Council (DLR) says this is suspected of having an "adverse impact" on water quality on bathing waters in the area.

The alerts follow visual inspections of bathing areas, along with the advice of the Health Service Executive (HSE).

Water scenes on Dollymount Strand in Dublin | Image: Sam Boal/Rollingnews.ie

Lifting of the restrictions is pending results from the testing of water quality.

Sampling of these locations took place on Monday and results are expected on Thursday.

While Dublin City Council has placed a bathing water notice at Dollymount Beach, following a stormwater overflow at Ringsend wastewater treatment plant.

Dublin City Council will display notices at the beach and the Environmental Protection Agency (EPA) website.

Separately, bathing prohibitions are already in place for the entire 2019 bathing season at Sandymount and Merrion beaches due to general water quality issues, unrelated to the Ringsend plant.

Irish Water says it regrets the impact this will have on beach users.