Temperatures recorded in parts of Ireland today were higher than those in the Caribbean, Brazil and the Mediterranean.
Met Éireann issued a warning for many parts of the country as temperatures were forecast to reach 28C.
Doctors advised people in areas of hot sunny weather to take all precautions against sunburn and sunstroke.
An increased number of people are seeking treatment for sunburn at doctor surgeries due to the good weather.
Doctors are advising people to stay covered and to stay out of direct sunlight if possible and to drink plenty of fluids.
Dr Philip MacMahon, a GP at Ranelagh Medical in Dublin, has said that nearly half a litre of fluid can be lost during a brief walk in the sunshine.
He also advised that extra vigilance should be taken with babies and older people.
Irish Water Safety appealed for people to stay within their depth when swimming in open water.
Age Action has urged the general public to check on older neighbours, especially those living alone, during the current warm weather.
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