Today is set to be a scorcher with the temperature predicted to hit nearly 40 degrees celsius, according to meteorologist Josh Fisher from weatherzone.com.au.

“The temperature will be in the high 30s today,” he said.

“Tuesday it will be slightly cooler in the lower thirties with a few showers predicted.

“Wednesday will be sunny and 37 degrees with Thursday reaching the high 30s, nearly 40 degrees.”

Mr Fisher said the change predicted for late this week should “cool things down”.

“The temperatures aren’t extreme, it’s just how long the heat is staying around for,” he said.

“There will be a few changes this week which are not very long lasting.

“It will very quickly heat up again.”

NSW Ambulance Service media relations officer David Morris said paramedics were urging everyone to be careful in the hot conditions.

“On days with high temperatures and high levels of smoke in the air from fires this summer, take care,” Mr Morris said.

“This is particularly important for the elderly, the very young, and those with respiratory conditions like asthma.

“It is also important to be aware of possible symptoms of heat exhaustion; nausea, vomiting, faintness, dizziness, loss of appetite, weakness and headaches.

“Lay the person down and apply cool, wet towels around the neck and under the arms and have them drink cool fluids if these symptoms occur.”

Mr Morris said if the person does not respond they should call triple-0.

“Some tips for staying safe in the heat include staying in the shade as much as possible, drink plenty of water and wear protective clothing from the sun.

“Never leave children alone in a car even for a short time, because heat generated in a closed car can quickly become fatal.

“Feed breastfed infants more frequently to help keep up their fluids and avoid outdoor exercise in the middle of the day.”