Royal Life Saving head Justin Scarr warns the week between Christmas and January 2 is often the deadliest period for drowning deaths and the upcoming summer heatwave may make matters worse.
"Choosing a safe location to swim, where lifeguards are on duty is essential. Avoid swimming in unfamiliar locations especially at rivers and unpatrolled beaches," he said on Friday.
Last summer 145 people drowned, making it the worst summer in more than 20 years.
The Royal Life Saving drowning toll has already hit nine drownings this summer.
The water safety body says after several years of missed swimming lessons because of the pandemic shutting pools and beaches, children of all ages are at increased risk of drowning.
Parents are advised to keep watch constantly, avoid distractions like social media, designate an adult supervisor at parties and recognise their child's swimming skills may not be up to scratch.
The festive spirit might call for a few celebratory drinks but Mr Scarr is asking swimmers to avoid alcohol around the water, especially inland waterways, including swollen lakes and rivers, because of consistent flooding.
"Alcohol was a factor in more than a quarter of drowning deaths last summer so we're asking everyone to stay off the beers until fishing, boating or swimming has finished," he said.
"Many rivers, lakes and dams have more water than in previous years and with lots of water moving downstream, especially after flooding. It's important not to let children play or swim in floodwater."
Extreme heat can also cause exhaustion and confusion, affecting a person's ability to swim to safety or stay afloat.
Lifesavers advise wearing a life-jacket when boating and fishing, surveying the conditions before jumping in the water and avoiding going alone for swim are all prudent measures to help prevent tragic summer mishaps.
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