Dubbo has sweltered through its hottest day for this summer and it’s facing another run of high temperatures.
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The preliminary maximum for the city on Sunday was 42.6 degrees, recorded at 3pm.
Authorities are warning people to take care and stay cool as the wave of heat hits the state.
About five people had presented to Dubbo Hospital in the past 72 hours with symptoms of dizziness, dehydration, weakness and feeling unwell, a Western NSW Local Health District (LHD) spokesman said.
The Bureau of Meteorology has forecast top temperatures of 39 degrees on Monday, 37 degrees from Tuesday to Thursday and then 40 degrees on Friday at Dubbo.
Residents across New South Wales are being urged to monitor weather reports and health advice as the heatwave conditions are expected to continue.
NSW Health warned people to drink plenty of water and limit their time outdoors.
NSW Police Deputy Commissioner Catherine Burn on Saturday revealed the state's heatwave plan had been activated to ensure a coordinated response from emergency services.
"We know over the next two or three days we're going to experience severe to extreme heat conditions throughout NSW," she said before reminding people it was an offence to leave children or pets in vehicles.
"Cars become a furnace very, very quickly in this type of heat."
Everyone needed to take care in hot weather, but some people were at higher risk of heat illness, especially if they were older, lived alone or were socially-isolated, police said.
Tourists, campers, and other holidaymakers who are in unfamiliar environments are urged to take extra care, especially when swimming.
Livestock and pet owners are also being urged to ensure adequate clean water is always available and that shading is provided where possible.
Additionally, no animals should be left in confined, unventilated areas.
Minister for Emergency Services and Dubbo MP Troy Grant urged people to take care in the heat in a post to social media.
The first-ever twilight edition of the New Year Athletics Carnival hosted by Dubbo Athletics Club went ahead, despite the heat.
Wendy and Greg Berger were there at Barden Park with their shaved ice business, a cool treat for competitors and spectators.
Gilgandra Jockey Club brought forward the races at its meeting to beat the heat.
The mercury reached a top of 42.7 degrees at Trangie at 3.30pm and 44.3 degrees at Bourke at 4.30pm on Sunday, the bureau reported.