The heatwave, sweeping across Sindh province, has been going on since the start of Ramzan on Friday, wreaking havoc and triggering an emergency situation in major hospitals of the province.
The death toll in worst-hit Karachi has topped 630 with another eight to 10 people dead in other parts of southern Sindh as a result of soaring temperatures, a senior health official was quoted as saying by media reports.
Temperatures of 44 to 45 degrees Celsius have been recorded in Karachi since Friday with the scorching heat continuing till today although the met office has forecast a break in the heatwave by this evening.
"We had until yesterday evening nearly 200 deaths from this heatwave," said Seemi Jamali, medical superintendent at Jinnah Hospital.
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"These 200 include dead bodies we have got from the scorching heatwave and those who passed away in the hospital while under treatment for heatstroke and dehydration," she said.
Doctors at the Abbasi Shaheed Hospital said 71 people had died due to the heatwave until yesterday. Saeed Qureshi, a doctor at the Civil hospital, confirmed 70 deaths.
The Sindh government has imposed a state of emergency at all hospitals, cancelling leave for doctors and other medical staff and is increasing stocks of medical supplies.
The Pakistan Army and paramilitary Rangers have also set up special centres for treatment of heat stroke victims and also supplied related medicines to government hospitals.