The Western NSW Local Health District has reeled out a list of tips on beating the heat.

This long weekend temperatures are expected to reach the mid-to-high 30s in many communities including Dubbo, Nyngan, Trangie and Cobar.

Director of Population Health Dr Therese Jones said the weekend would mirror the heatwave conditions experienced in NSW in recent weeks and a few simple precautions could prevent illness and safeguard an enjoyable long weekend.

"The Australia Day long weekend is typically a great time to have barbecues, play some cricket in the backyard and enjoy time with friends and family," she said.

Dr Jones said residents were generally heeding the message to keep cool, stay well-hydrated, check on friends, particularly the elderly, and plan their day to avoid the heat.

Symptoms of heat exhaustion include nausea, vomiting, increased heart rate and shallow breathing.

People experiencing severe symptoms should seek medical treatment.

Certain people are at higher risk than others of suffering from heat-related illness, including those who are older than 75 years, overweight, pregnant, breastfeeding, working outside, exercising in the heat, or ill.

Dubbo's maximum temperature will dip to 34 degrees tomorrow and 32 degrees on Monday, with showers forecast for both days.