HIGH temperatures are forecast for the Mid North Coast tomorrow with Coffs Harbour expected to reach 35°C, closing in on its hottest day this year of 36.5°C.
Bureau of Meteorology NSW severe weather manager, Michael Logan, said heatwave conditions will continue into Saturday before a southerly change reaches the north east NSW.
Heatwave conditions are caused by the combination of an approaching front and slow moving high pressure system over the Tasman Sea, which draws dry hot air from central Australia into NSW.
A severe heatwave warning has been issued and people are encouraged to monitor the bureau's website and news media for the latest weather conditions.
With summer around the corner, emergency services are advising locals to stay keep cool and be aware of heat exhaustion.
NSW Health recommends people can beat the heat by drinking plenty of water keeping your body and house cool, try to avoid strenuous outside activity and stay out of direct sunlight.
Symptoms of heat exhaustion include, nausea and vomiting, fainting and dizziness, loss of appetite weakness and/or headache.
NSW Ambulance paramedic Shaun Kelly said those caring for the sick, elderly or young children are asked to be vigilant in identifying symptoms of heat exhaustion.
"Anyone can be affected by dehydration or heat exhaustion but those who are most vulnerable are the very young, the elderly and those with pre-existing medical conditions," said Paramedic Kelly.
If someone is suffering from heat exhaustion it's important to lay the person with cool wet towels around the neck and provide drink cool fluids to stay hydrated.
Call triple zero if symptoms persist or the person shows signs of confusion or collapses.
For more information visit health.nsw.gov.au/environment/beattheheat.
To see heatwave forecast maps, visit, bom.gov.au/australia/heatwave.