The National Flag will be flown at half-mast in the state capital and all districts and sub-divisional headquarters of Assam, a government release said here.
Lt Gen (Retd) Sinha served as Governor of Assam from September 1, 1997 to June 4, 2003. He was also the governor of Jammu and Kashmir.
Governor Banwarilal Purohit condoling Sinha's death in his message said Assam has lost a true hero whose heroic actions brought the state virtually out of insurgency.
"His death is an irreparable loss to the country," Purohit said.
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Chief Minister Sarbananda Sonowal too condoled the death and said Sinha's service to the state will always be remembered by its people.
"Late S K Sinha was a true friend of the state who always stood by its people.
"His role as the Governor of Assam on the issue of illegal migration will be remembered by the people of the state forever," he said in his condolence message.
Sinha would also be remembered for his contribution in projecting saint Srimanta Sankardev, General Lachit Borphukan and Assam's first chief minister Gopinath Bordoloi as national heroes.