The warm spell will continue across the eastern half of the country today with highs of 28C as temperatures drop back elsewhere.
Met Éireann forecasts that temperatures will remain around normal for the rest of the week.
There will be a fair amount of dry weather apart from a few showers or patchy light rain. However, it will turn wetter this weekend.
A status yellow high temperature warning is still in place for Leinster until 7pm this evening.
Very warm weather will continue to occur over Leinster with daytime temperatures of between 25C to 28C.
The forecaster has also issued a Status Yellow thunderstorm warning for thirteen counties today.
The alert, covering counties Carlow, Dublin, Kilkenny, Louth, Meath, Wexford, Wicklow, Cavan, Donegal, Cork, Tipperary, Waterford and Leitrim, was issued at 9.30 this morning and is valid until 9pm.
Met Éireann said thuderstorm activity is forecast today for southern and eastern areas with localised heavy rainfall which may cause some localised flooding.
Today will continue warm over the eastern half of the country with highest temperatures between 22C to 27C or 28C.
However, it will be cooler and fresher elsewhere with highs of between 16C to 22C degrees.
A largely dry start with bright or sunny spells but cloud will build from the west this morning, with outbreaks of showery rain spreading from the Atlantic through the day.
There is the chance of an isolated thundery burst and light winds will increase moderate to fresh northwesterly with the rain.
Dr Kieran Hickey, the head of the Department of Geography at University College Cork said there is currently an “extreme heatwave” happening across Europe.
“Obviously now we’re at the peak of the summer in terms of temperatures but when we see temperatures in the high 40s in western Europe, we really have to take notice,” he told RTÉ’s Morning Ireland.
“And I suppose especially when we’re going to see England go through the 40C barrier at some stage today or even 41C, it’s definitely telling us something about the climate.
“The story is telling us is exactly what we said global warming is going to do to northwestern Europe, it is starting to happen.
“It’s not going to happen every summer but certainly we’re going to see these types of events much more frequently and starting to affect Ireland as well. Although we’re reasonably well protected being way out in the Atlantic Ocean.”
There will be a good deal of dry weather tomorrow with scattered light showers in the morning becoming mostly confined to west and northwest coasts through the afternoon.
A generally cloudy start to the day but sunny spells will break through as the day goes on.
Temperatures will be around normal with highs of between 15C in the northwest to 21C in the southeast in moderate northwest winds.
There will be a bright start to the day on Thursday with sunny spells and just a few light showers.
However, it will become cloudier by afternoon with patchy light rain and drizzle developing along western and southwestern coasts.
Highest temperatures will between 16C to 20C in a light variable breeze.
There will be a cloudy to start the day on Friday with some lingering rain and drizzle in the east and north.
It will brighten up for a time in the morning and early afternoon with just a few light showers but it will turn cloudier again later with outbreaks of rain and drizzle pushing into western areas towards evening.
There will be highest temperatures of between 17C to 21C in a light to moderate southwesterly breeze.