WorkCover Dubbo district co-ordinator, Mark Smith said the risks were real, with many workers seriously injured or dying while working in hot conditions in the past.

Mr Smith said fatigue and heat stress were the major causes of injury during the summer months.

"They can reduce a worker's performance and productivity, plus increase the chance of injury by reducing the ability to concentrate, recognise risks and communicate effectively.

"In fact, in the three years to July 2013 there were 307 claims for workplace fatigue and heat stroke at a cost of $3.5 million to the to the NSW Workers Compensation Scheme, so it is a significant risk that needs to be taken seriously and managed effectively."

He said the compensation figure included 19 claims in the western NSW which added $203,000.

Mr Smith said workers and businesses needed to work together to ensure everyone came home safely during summer.

"Under NSW work health and safety laws, there is no prescribed temperature limit that a worker can be exposed to at work," Mr Smith said.

"Management and workers should work together to minimise heat impacts and keep an eye out for each other.

"This can be achieved by providing workers with information on how to work safely in the sun and hot conditions.

"They should also set realistic workloads and work schedules, ensure fair distribution of work and provide shaded rest areas and regular breaks.

"Supervision is also important as people can deteriorate quickly if heat effected.

He suggested residents re-schedule work to cooler times in the early morning or late afternoon.

He said workers should drink at least 200 millilitres of water every 15 to 20 minutes.

"It is important that workers don't rely on energy or caffeinated drinks which can have a diuretic effect."

Mr Smith said workers were exposed to UV radiation even when in the shade.

"People need to wear sun protection in all outdoor conditions," he said.