The hot weather has led to a 10 per cent fall in donations to the blood board.
Stocks have now fallen to 4 days of supply in the main blood groups.
The Irish Blood Transfusion Service is calling on people to make a special effort to donate blood in advance of the bank holiday weekend
The Board says if the trend continues it will impact significantly on the ability to meet demand from hospitals.
Its calling on donors to make a special effort to give blood in the lead up to the bank holiday weekend and in the weeks following.
The group is urging people to donate as soon as they can before supplies reach critically low levels.
