Temperatures are set to reach the high 20s.
People in the Midlands are likely to see some of the highest temperatures when it comes to this week's heatwave.
A weather advisory coming in tonight until next Tuesday is warning of an increased risk of dehydration and heat stress, as well as uncomfortable sleeping conditions at nighttime.
Met Eireann is also appealing to people to take extra care on beaches and near waterways.
Meteorologist Aoife Kealy explains where will see the highest temperatures:
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