Research by KBC Bank Ireland suggests the summer heatwave encouraged consumers to spend but at the cost of dipping into their savings.
The bank's latest quarterly Savings Barometer, for the three months to the end of July, found 36% of Irish consumers reported an increase in their spending following the heatwave.
Adults with young children were the most likely to have incurred unplanned expenditure. Of that group 47% said they had spent more than they intended during the good weather.
The KBC survey, carried out by market research firm Millward Brown, found the unplanned spending included daytrips, barbeques, summer clothes and garden furniture.
Of those who said they spent more than they intended to during the summer 39% said the covered the extra spending by dipping into savings.