It comes as temperatures in the region are forecast to stay in the high 30s for several days in a row, with many people seeking relief from the heat in water recreation.

Since mid-December people have been advised to avoid touching the water at Lake Hume because of high levels of blue-green algae. Following satellite surveillance and water monitoring results returned on Thursday, Water NSW and Goulburn Murray Water confirmed the red alert would stay in place.

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Monitoring and surveillance are set to continue, with a safety update expected in the coming weeks.

Interaction with blue-green algae carries a risk of infection, contamination and illness. Specifically, gastroenteritis is a risk associated with blue-green algae, of which case numbers have spiked locally in recent weeks.

Responding to the region's heat wave, Murrumbidgee Local Health District public health acting director Alison Nikitas said heat related illness can affect anyone.

"Heat puts a lot of strain on the body and can cause dehydration, heat exhaustion and heat stroke. It can also make underlying health conditions worse," Ms Nikitas said.

"Plan your day around the heat. Stay indoors between 11 am and 5 pm and minimise physical activity."

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