Seven Dublin beaches remain closed to swimmers due to poor water quality.
Brittas Bay south in Wicklow and Garryvoe in Cork are also affected.
Fingal County Council's Environmental Health Officer, George Sharpson, says they're on alert given that more rain is on the way.
Meanwhile, two venomous types of jellyfish have been seen in Irish waters.
A girl was rushed to hospital in Cork after being stung at Barleycove in Cork, but it's now known what type of jellyfish was responsible.
Portuguese Man O'War have been seen in Waterford, while Lions Mane have been sighted in Dublin's Sutton.
John Leech of Irish Water Safety says there are a couple of reasons for the increase in jellyfish:
