Four hours of continuous rain overnight in Islamabad left the city largely submerged, Geo News reported early Saturday morning.
Sector H13 of Islamabad was particularly flooded due to the heavy rain, with water entering the basements of buildings in the neighbourhood.
People incurred millions of rupees worth of damages and rescue teams could not enter the area to aid those stranded.
Later in the morning, Commissioner Irfan Nawaz said that The Metropolitan Corporation Islamabad along with the district administration were draining the water with de-watering pumps.
The Pakistan Meteorological Department has forecast that the weather will remain hot, humid, and partly cloudy in the majority of the country today (Saturday), whereas thunder and precipitation are likely in Islamabad, Punjab, Khyber Pakhtunkhwa, and Balochistan.
The Met Department also forecast heavy rains in Upper Khyber Pakhtunkhwa, Upper Punjab, and Kashmir.
Meanwhile, rain with strong winds and thunderstorms is expected in lower Sindh and Kashmir.
Heavy rains in twin cities
In Rawalpindi, the Water And Sanitation Agency (WASA) has issued a high alert.
Heavy equipment has been delivered to low-lying areas, and authorities are monitoring the water flow in Nullah Lai, according to the WASA Managing Director, Muhammad Tanveer.
According to MD WASA, the twin cities of Islamabad and Rawalpindi have received a total of 55mm of rain. He said the water level at the Katarian point of Nullah Lai is 12 feet, while at Gawalmandi Bridge is nine feet.
A WASA spokesman said that rescue teams have been deployed to Committee Chowk Underpass, Liaquat Bagh, Sadiqabad, Satellite Town, and Jamia Masjid Road.
According to the Met Department, 56mm of rainfall at Zero Point and 54mm at Golra 54mm was recorded in Islamabad,
Bokra received 51mm of rain, Syedpur received 47mm, and the airport area received 40mm of rain.
Meanwhile, 45mm of rain fell in Shamsabad and 43mm in Chaklala.
The Met Department said that intermittent rain will continue until tomorrow.