After a slight decrease from severe levels, the mercury is hovering around 40 degrees Celsius in most regions
They were found abandoned on a street between RU and the Rajshahi University of Engineering and Technology on early Sunday.
But no one was immediately held over the seizure.
RAB-5 Assistant Director ASP Mirza Golam Sarowar said they raided the area on a tip-off that a huge quantity of explosives had been stored for causing trouble during Sunday's strike.
He said their bomb squad had neutralised the explosives.