The worst-affected suburbs include North Perth, Balcatta, Doubleview, Bayswater, Embleton, Nollamara and Westminster. Perth continues to sweat through one of its more intense heatwaves in recent memory. On Christmas Day the maximum was 42.9 - the hottest on record. Boxing Day went even higher, at 43.5C and Monday recorded a 41C high. On Monday, approximately 11,000 customers were blacked out - meaning no fridge, no aircon and no phone lines.