Status Yellow rain and wind warnings are in place today, but a dramatic change in the weather is due by Wednesday, according to forecasters at the national weather service.
As well as this, there will be a possibility of localised spot flooding, Met Eireann warned.
Those counties were Galway, Mayo, Sligo, Clare, Cork, Kerry, Tipperary and Waterford.
While winds of up to 65 kilometres per hour and gusts of up to 110 kilometres per hour are expected in Atlantic coastal areas between 9 am this morning and 6 o'clock tomorrow morning. Heavy showers will then follow, turning persistent before nightfall.
A wind warning is in place for the entire country until 6am on Tuesday.More news: Vladimir Putin warns of global 'chaos' if West attacks Syria again
The good news is that the heavy rain is expected to clear early on Tuesday as a 1,500-mile wide "African air plume" brings bright and sunny weather, with temperatures hitting a seasonably pleasant 16 Celsius.
However, throughout the course of the day sunny spells will begin to develop in most areas, with temperatures reaching 13C to 16C. Temperatures are expected to between 17 and 18 degrees on Wednesday and Thursday. "We're only going to see these conditions last for a couple of days - a heatwave needs to have consistently high temperatures for a certain period".
By this afternoon, wet and windy weather in Atlantic coastal counties is forecast to spread eastwards to most places - though the east coast will stay mainly dry until evening time.
The Met Éireann spokesperson said that the warm weather is very unusual for this time of the year.