An urgent Status Yellow weather alert has been issued for 11 counties as unusual conditions are set to hit Ireland.
The alert is in place for Clare, Cork, Kerry, Limerick, Waterford, Donegal, Galway, Leitrim, Mayo, Sligo and Wexford.
It comes into force from 3am and will stay in place until 10pm on Monday.
The warning reads: "Southwesterly winds, veering northerly through Monday will reach mean speeds of 50 to 65 km/h with gusts up to 100 km/h, particularly in coastal areas and on higher ground.
"Heavy rain in conjunction with the wind will lead to spot flooding with a risk of wave overtopping in coastal areas."
And conditions will remain unsettled throughout the rest of next week, with hail, sleet and even some wintry showers possible.
A Met Eireann forecaster said: "A wet and windy start to Bank Holiday Monday with further heavy spells of rain leading to spot flooding. Fresh to strong and gusty southerly winds will veer westerly with some damaging gusts through the day. Winds will continue to reach gale force along coastal areas of the southeast, southwest and west. In the afternoon, rain will break up into showers with some sunny spells developing, but with the risk of hail too. Highest temperatures of 10 to 12 degrees.
"Tuesday will be cool and blustery with sunshine and widespread showers. Some showers will be heavy with hail and possible sleet on higher ground. Highest temperatures of 7 to 11 degrees Celsius, coolest across Ulster, in a fresh and gusty northwesterly wind.
"Showers will become confined mainly to the northwest on Tuesday night with long clear spells developing generally. Cold with lowest temperatures of -1 to +2 degrees Celsius, in light to moderate northwesterly winds. Frost may develop locally.
"Wednesday morning will begin fairly sunny, although there will be some scattered showers in the northwest. Showers will become more widespread during the afternoon gradually dying out during the evening hours. Another cool day with highest temperatures ranging 7 to 11 degrees, coolest in Ulster, with light northerly or variable breezes.
"Like Wednesday morning, Thursday will begin fairly sunny, although there will be some scattered showers in the northwest. Showers will become more widespread during the afternoon gradually dying out during the evening hours. Another cool day with highest temperatures ranging 8 to 11 degrees, coolest in Ulster, in a mostly moderate northwest breeze.
"Tentative signs for milder weather next weekend but unseasonably wet and windy too."
