Senior provincial health official Saeed Mangnejo said on Tuesday that he expects the number of fatalities to climb further.
Mangnejo says the death toll is for the past three days, though most of the deaths were reported in the province's largest city, Karachi.
Temperatures reaching 45 degrees Celsius (113 degrees Fahrenheit) struck Karachi over the weekend. Hours-long power outages also hit the city, leaving fans and air conditioners inoperable.
