The maximum temperature in the city shot at least five notches above average to 43.8 degrees Celsius, making it the season's hottest day so far, Met officials said.
The minimum temperature in Jammu was recorded at 26.3 degree Celsius.
Weatherman predicts there would further increase in the temperature in the next few days.
The scorching heatwave have brought the normal life in Jammu city to grinding halt as most of people were off the streets in the comfort of coolers and air conditioners at home.