State Chief Electoral officer Vivek Kumar Dewangan said the percentage was expected to go up as long queues were still visible outside several polling booths.
"We are waiting for the final figures," he told PTI.
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Some cases of causing damage to the electronic voting machines (EVMs) were reported in Chandel Assembly segment. The EVMs were replaced within a short time, he added.
The 22 Assembly segments, where polling is being held, are spread over the valley district of Thoubal and the hill districts of Ukhrul, Chandel, Tamenglong and Senapati.
A huge voter turnout of 84 per cent was recorded in the first phase of polling to the 60-member Assembly on March 4.