The good weather's expected to last for the rest of this week.
Temperatures are expected to hit highs of 24 degrees in some places.
Some sunny spells will develop later today.
Cathal Nolan from Ireland's Weather Channel looks ahead.
"Conditions for the coming week are expected to be excellent across the country.
"We do expect to see an area of high pressure which has been in place for the last number of days retaining its position across the country, and with that it is expected to bring pretty settled conditions for most areas across the country.
"Temperatures by day are probably going to get up to get up to 23 or 24 degrees celsius, with winds pretty being pretty light easterly or variable in direction, so excellent conditions for this time of year."
