A storm which is set to batter the south coast of England will also bring heavy rain to the counties of Cork, Waterford and Wexford over the next 24 hours.
Storm Evert, as it is named by the UK Met Office, is the first of the summer storms.
It will bring winds of up to 110 km/h to Cornwall and parts of south Wales.
Status Yellow - Rain warning for Cork, Waterford, Wexford⚠️
— Met Éireann (@MetEireann) July 29, 2021
Heavy or thundery showery rain expected with the risk of spot flooding.
Valid: 15:00 Thursday 29/07/2021 to 05:00 Friday 30/07/2021https://t.co/Xg3aMJlyuS pic.twitter.com/10u4eRyqzt
An unseasonably deep, low pressure named #StormEvert by @metoffice will track south of Ireland tonight, with windy conditions offshore.
— Met Éireann (@MetEireann) July 29, 2021
Heaviest rain & strongest winds in UK. Southern counties in Ireland can also expect a spell of wet & breezy weather this evening & tonight⚠️ pic.twitter.com/u2SAYFt6ny
Met Éireann on Thursday issued a status yellow rain warning for Cork, Wexford and Waterford until 5am on Friday.
Most places will see heavy downpours on Friday and temperatures will be around normal for the time of year, Met Éireann said.
Heavy and thundery rain brought flash flooding to many places including Malahide in Dublin earlier this week, following the recent dry spell.
Parts of Co Tipperary got 40mms of rain in a few days.
The forecaster said there will be more rain and wind during the weekend.
Saturday and Sunday afternoon will see the best of the bank holiday weekend’s weather with warm sunny spells though temperatures will be nowhere near as high as during the heatwave.
It will be mostly dry on Bank Holiday Monday with sunny spells, but there will be scattered light showers too with highs of 17 to 20 degrees, in a light northerly breeze.
Met Éireann forecaster Linda Hughes said the weather will be "useable" for those looking to get out and about for the weekend and it will feel pleasant in the sunshine.
She said Ireland is now on the southern side of the jetstream which brings with it fresher and cooler air and a succession of low pressure systems.
Current indications suggest Tuesday will remain mostly dry, with rain pushing in from the west Tuesday night.
The rest of the week looks unsettled with temperatures around average for early August.