Lifeguards in Counties Sligo, Donegal and Roscommon rescued 42 people during the recent heatwave and prevented a further 305 accidents.
The July figures released by Irish Water Safety, highlight the dramatic rise in water incidents during the few weeks of good weather.
According to the figures 24 people were rescued from the sea, lakes and rivers in Co Sligo while 17 were rescued in Donegal and one was rescued in Co Roscommon.
In addition 34 lost children were reunited with their parents in Co Sligo during July and lifeguards prevented a staggering 290 accidents in the county last month.
Nationally, 11 people lost their lives and a further 559 swimmers were rescued during July, 160 more than the entire bathing season in 2012.
The CEO of Irish Water Safety John Leech, is urging the public to only use Local Authority manned lifeguard bathing places to ensure there are no more tragedies this Summer.
“Take heed of advice given by the lifeguards and supervise your children, lifeguards are not baby-sitters,” he stressed.