An immediate wind warning has been issued for five counties in the north and west of Ireland.
Met Eireann has posted the Status Yellow alert as Donegal, Leitrim, Mayo, Galway and Sligo are set to be battered by gusts as strong as 100km/h.
The weather chiefs say westerly winds averaging speeds of up to 60km/h will hit these counties on Sunday.
The warning is valid from 10am to 10pm on Sunday.
A rainfall alert will also be in place for these counties - but not Galway - until 9am on Monday.
A spokesman said: "There will be heavy rain and blustery conditions at times, from Saturday morning through to early Monday, leading to accumulations of 40 to 60mm with spot flooding.
"Higher totals are expected in mountainous areas with the risk of flash flooding."
Meanwhile, Met Eireann has warned torrential rain will lash parts of the country at times, posing a risk of "flash flooding" in some areas.
The downpours are expected to be worst in Donegal, Leitrim, Mayo and Sligo, where up to 60mm of rain was forecast to fall between yesterday and today.
Highest temperatures nationwide aren't predicted to surpass 13C apart from places in the south during sunny spells.
There will be "heavy bursts" of rain at times while winds could reach gale force along coasts later on.
The spokesman said: "Windy today with showers or longer spells of rain affecting the northern half of the country.
"There will be heavier bursts at times, bringing a risk of spot flooding mostly in the northwest.
"Elsewhere, predominantly dry with some bright spells and just a few passing blustery heavy showers.
"Maximum temperatures of 11 to 13 degrees generally, rising to between 14 and 16 degrees in any bright spells in the south, with fresh to strong west to southwest winds reaching near gale to gale force at times along exposed coasts of the west and northwest."
