CFMEU EBAs state that workers will stop work and leave site when the temperature reaches 35 degrees. The temperature is measured at the nearest Bureau of Meteorology weather station to the work site.
A printable version of this heat policy which includes starategies for working in hot weather that's below the 35 degree cutoff can be found here.
Workers should not be discouraged from taking necessary rest breaks. Report all heat stress incidents to the First Aider and the PCBU. Workers who experience symptoms of heat stress must report to the First Aid shed for medical attention. If in doubt you can speak to your delegate, HSR on site or contact us.