The warning comes into effect at 12pm
Temperatures could reach 30 degrees Celsius today.
A Status Yellow high temperature warning for much of the country comes into effect later.
From 12pm, counties Kildare, Carlow, Kilkenny, Laois, Longford, Offaly, Westmeath, Cavan, Donegal, Munster and Connacht will be under the warning until until 6am Friday, July 17th.
Farmers are being reminded to make sure their animals have plenty of water and shade during the hot weather, with the IFA warning the high temperatures could have an impact on crops and animal welfare.

Kildare Represented By Three Teams At National Bowls Competition
National Parents Council Conference Taking Place In Kildare School This Weekend
Yellow Fog Warning Issued For Kildare
"No Movement" On Safety Upgrades To "Dangerous" Newbridge Bus Stop, Says Cllr
Almost €68K Announced For Kildare Community Centres
Sallins Man Onboard Diverted Aer Lingus Flight Shares His Experience
Kfm Obituary Notices
Carlow GAA Release Statement After Man Dies At Netwatch Cullen Park