KarachiMercury hit 41°C, the hottest September day in a decade.
High humidity turns this heat lethal for outdoor workers and slum residents facing power cuts.
Humid heat blocks sweat from cooling the body, and a low-pressure system trapped over Pakistan blocked the cooling sea breeze.
“El Nino conditions are driving regional atmospheric warming,” said Ameer Hyder Laghari, the city’s chief meteorologist.
The city’s 2015 heatwave killed more than 1,200 people, a toll officials hope isn’t repeated.
Sources: Dawn