In the plains of Sindh and Punjab the mercury could rise to 48 to 50 degree Celsius, the met department said.
The met department has advised people to observe caution during the scorching weather spell, which coincidentally comes with the fasting month of Ramazan.
The met department has also forecast thunderstorm and rainfall in Hazara, Rawalpindi and Gujranwala divisions and Kashmir region.
The central and southern plains of the country including Sahiwal, D.G. Khan, Multan, Bahawalpur, D.I.Khan, Bannu, Sukkur, Larkana, Shaheed Benazir Abad, Hyderabad, Sibi and Naseerabad divisions will likely to affect most in the hot weather.
The weather will remain hot and humid from Monday to Thursday in Rawalpindi, Gujranwala, Lahore, Faisalabad, Sargodha, Kohat and Peshawar divisions.
The plains of Punjab, upper Sindh, central and southern parts of Khyber Pakhtunkhwa and Sibi and Makran divisions of Balochistan would feel the heat of the intense weather in the next 24 hours.
The maximum temperature in Pakistan yesterday recorded at Noorpur Thall, Bhakkar, Rahim Yar Khan, Sukkur and Larkana (48 Celsius), Dadu, Jacobabad, Bahawalnagar, Sibi, Shaheed Benazir Abad (47 Celsius), Lahore, Okara, Bahawalpur, Joharabad, Sahiwal, Sargodha, Jhelum, Padidan, Rohri, Mohen-jo-Daro and Hyderabad (46 Celsius).