People are being urged to be safe on the water and smart about the heat, as temperatures are set to hit more than 40degC across NSW.
This time last year paramedics say they responded to a spike in triple-0 calls at beaches and pools, with people having jet ski accidents, getting caught in rips, and drowning.
To try to prevent history from repeating itself, NSW Ambulance are urging people to be safe when battling the heat.
People are expected to migrate to the beach across the state's coast, with temperatures tipped to hit 32degC in Sydney, 31degC in Bondi and 34degC on the state's north coast.
In the city's west tops of 36degC are forecast for Penrith, while areas in the Central Tablelands are also expected to reach about 36degC.
Dubbo in the state's central west is expected to experience tops of 39degC, while Bourke in the state's upper west looks to be one of the hottest spots at 46degC.
"In the west of the state where temperatures of over 40 degrees are expected, dehydration and heat stroke are a real threat. In these areas and across the state, if you need relief from the heat stay inside in an air-conditioned environment, keep up your water intake and minimise the consumption of alcohol in the hottest parts of the day," NSW Ambulance said in a statement.
It also reminded people never to leave a child or pet shut in the car, to keep up the sunscreen and drink lots of water.
"Retreating from the heat does not necessarily mean just flocking to the beach or the pool to cool down without taking precautions," the emergency service said.
