Laois and Offaly are included in the warning extension.
A status yellow high temperature warning for nine counties has been extended into Friday evening.
20 counties in the midlands, west and south are already under a similar advisory until 6am tomorrow.
Carlow, Kilkenny, Laois, Offaly, Cork, Limerick, Tipperary, Waterford and Wexford come under another yellow alert from 12 noon until 8pm tomorrow.
Alan O'Reilly from Carlow Weather is looking at today's forecast:
Temperatures are expected to reach the high 20s, while there is an increased risk of wildfires.
Ailish Hankinson from Met Eireann the good weather is set to continue into next week:
Alan O'Reilly from Carlow Weather says this heatwave could be a record breaking one:
Retailers are being asked not to sell disposable barbeques for the duration of a Status Orange forest fire warning.
The Department of Enterprise has agreed the move with the National Parks and Wildlife Service, following a request from the National Directorate for Fire and Emergency Management.
A fire danger notice is currently in place until midday on Friday, but could be extended as dry conditions continue.
The recommendation comes as disposable barbecues are blamed for a blaze in Killarney National Park this week.
Head of the National Directorate for Fire and Emergency Management Keith Leonard says conditions are perfect for fires to spread:
Vincent Jennings, CEO of Convenience Stores and Newsagents Association, says it's not a reasonable ask to pull them from shelves:
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