With no possibility of rainfall on Friday, the relative humidity is likely to be 68 per cent against 54 per cent on Thursday, IMD said.
On Friday, Death Valley National Park in California recorded a staggering high of 130 degrees Fahrenheit (54 Celsius) and could reach the same high on Saturday.
Heatwaves have claimed more than 17,000 lives in 50 years in India, according to a paper recently published by the country's top meteorologists.
Mercury is likely to drop by 3-4 degrees Celsius over the next five days
Hundreds of deaths were being investigated as heat related in Oregon, Washington state and British Columbia.
Mount Shasta, the volcano that towers over the region, was shrouded in a haze from smoke plumes that could be seen in images from weather satellites in space.
Lack of rainfall and hot winds blowing from Rajasthan was behind the severe weather condition, IMD said.
Oregon health officials said late Wednesday more than 60 deaths have been tied to the heat, with the state’s largest county, Multnomah, blaming the weather for 45 deaths since the heat wave began Friday.
Much of the US East Coast is expected to witness temperatures top 32 degrees Celsius until Wednesday, reports Xinhua news agency.
The record-breaking temperatures this week are a weather emergency, scientists and health care experts say, with heat responsible for more deaths in the US than all other natural disasters combined.
Record daily highs of heat waves were seen this week in parts of Arizona, California, New Mexico, Montana, Wyoming and Utah.
Phoenix, which is seeing some of the highest temperatures this week, tied a record for the second day in a row when it reached 115 degrees (46 Celsius) Wednesday and was expected to hit 117 (47 Celsius) each of the next two days, the National Weather Service said.
In a sign of relief from the sweltering summer heat prevailing in most parts of the country, the India Meteorological Department's (IMD) on Saturday also forecast "no heat wave conditions likely over any part of the country during the next five days".
The Safdarjung Observatory, which provides representative data for Delhi, recorded a minimum temperature of 29 degrees Celsius, a notch above normal, it said.
Heat wave conditions are likely to prevail in various districts of Rajasthan for the next two days, a MeT department official said on Monday.
Bikaner and Phalodi recorded 45.4 degree Celsius while the maximum temperature in Ganganagar, Sawaimadhopur, Pilani, Kota recorded 45, 43.7, 43.1 and 42.2 degrees, respectively, according to MeT Department.
According to the regional meteorological centre, the highest maximum temperature in the last 24 hours was recorded in Bharatpur (45.4 degrees Celsius) followed by Ganganagar (44.5 degrees Celsius).
The National Disaster Management Authority (NDMA) has issued an advisory for the severe heatwave conditions prevailing in several parts of India. The NDMA said that heatwave conditions are slated to peak on Tuesday due to prevailing dry winds blowing over northwest India, central India and adjoining interior parts of eastern India.