Met Eireann has issued a status yellow high temperature warning for 14 counties, as temperatures are expected to reach 27 or 28 degrees later today.
The warning applies to counties Galway, Roscommon and Leitrim, as well as Carlow, Kildare, Kilkenny, Laois, Longford, Offaly, Westmeath, Meath, Limerick, Tipperary and Clare.
The met office is advising of high temperatures between 2 and 7 pm today.
The Sligo Stages Rally, due to be held this Sunday, has been cancelled due to the ongoing hot weather.
The Connacht Motor Club has issued a statement, saying that due to the current exceptional weather conditions, the difficult decision has been made not to run the Sligo Stages Rally next Sunday.
The committee is currently exploring options, including a potential window of opportunity for Sunday week 15th July, and will issue a further statement this evening.
Melting bitumen is now causing significant problems for motorists in many parts of the West of Ireland as the heatwave continues.
Mayo County Council outdoor staff have been dropping grit and sand on roads that are melting in the heat, to improve the grip.
Mayo Road Safety Officer Noel Gibbons says this is an unfortunate side effect of the good weather, and motorists should slow down where the bitumen is melting, while cyclists and motorcyclists also need to take extra care...