Met Éireann has issued a status orange wind warning for three western counties where winds gusting at up to 120 km/h are expected on Saturday.
The second highest level of alert will be in place between midday and 4pm in Donegal and Mayo and between 1pm and 6pm in Galway.
A status orange weather alert warns of infrequent and dangerous weather conditions which may pose a threat to life and property and people should not venture out in such conditions.
There is a yellow wind warning in place for all other counties with winds forecast to strengthen during Saturday. Gusts may reach up to 110km/h.
A status yellow rain warning is also in place for the entire country from noon on Saturday until 3pm on Sunday. Up to 40 mm of rainfall is expected on Saturday with a further 40mm likely on Sunday. There is a risk of localised flooding, especially over the western half of the country.
We aware of the current weather advisories. As public safety is our primary concern, we are keeping the situation under review. Our intention is that the Opening Ceremony will still go ahead, but may be subject to alteration. We will update further on Saturday morning.
— Galway 2020 (@galway2020) February 7, 2020
Storm Ciara is set to cross the country on Sunday, but its worst impact will be experienced in Northern Ireland and Britain, with the British Met Office warning that it could be the most violent storm to hit there since 2013. The Met Office expects widespread gales that could pose a danger to life.
Met Éireann said it will produce very strong winds over Ireland on Sunday and could cause damage.
Over the weekend the combination of spring tides and high seas as well as stormy conditions will result in an elevated risk of coastal flooding especially along southern, western and northwestern coasts, it said.
The opening ceremony for Galway2020, which is due to take place on Saturday at 6pm in South Park, Claddagh, is now under review because of the weather.
In a statement the organisers said Galway 2020 is aware of the current weather advisories. As public safety is our primary concern, we are keeping the situation under review. Our intention is that the event will still go ahead, but may be subject to alteration. We will update further on Saturday morning.
Storm Ciara will be followed by strong blustery winds and icy temperatures which could bring 10cms of snow to Northern Ireland and blizzard conditions.
Met Éireann forecaster Aoife Murray said heavy rain will arrive into Connaught and west Ulster from midday and will spread across the country reaching the east coast by evening time.
It will be wet and windy for the rest of the day, she said. There will be a brief respite on Saturday night, but the winds will only ease off slightly. Everywhere is susceptible to heavy rain and with it damaging gusts on Sunday.
Monday and Tuesday could see snow in many places especially along the western seaboard. The highest chances of snow will be between Monday night and Tuesday morning and temperatures may be cold enough for lying snow on Tuesday morning.