A moderate heat wave is likely to continue in Karachi and southern parts of Sindh, the Met Office said on Sunday.
It said maximum temperature is likely to range between 39 – 41ºC during the next two days.
Meanwhile, hot and humid weather is expected in most parts of the country. However, rains is expected at isolated places in Kashmir.
Hot and humid weather is expected in most parts of the country.
The Meteorological Department on Friday forecast that a mild heat wave is likely to affect Karachi during September 21 to 24.
The Met Office warned that the maximum temperature was likely to remain in the range of 38 to 40 degrees centigrade with surface wind expected to blow from East-Northeast during the period.
Last year, a heatwave killed 65 people in Karachi in three days when it coincided with power outages and the holy month of Ramadan.
In June 2015, a heat wave had killed more than 400 people in the metropolis.
Earlier, Heavy rain lashed Karachi amid an ongoing monsoon spell, turning the weather pleasant.
The areas which received showers included Surjani Town, UP More, North Karachi, University Road, Gulistan-e-Jauhar, Shahrae Faisal, Saddar, DHA, II Chundrigar Road and others.
That was the third spell of rain in Sindh. Many areas were flooded in Karachi and other Sindh cities due to heavy rain.
The supply of electricity was also suspended in multiple areas of the megapolis as a precautionary measure by K-Electric to prevent electrocutions.
The power distribution company partially suspended the supply of electricity due to water logging in parts of Bin Qasim, Orangi, Baldia and Gulshan Iqbal, as well as in kunda-infested areas as a safety measure.
It urged the civic bodies to ensure drainage of water for safe and swift restoration of power.
At least 30 people were electrocuted to death in Karachi during the last two spells in July and August.