Rouhani pushed back against criticism from conservatives over his economic performance, saying there had been measurable improvements in agriculture, healthcare, energy and internet coverage, especially in villages and poor suburbs.
He also focused on his key achievement, a nuclear deal with world powers that ended some sanctions in return for limits to Iran's atomic programme.
"In every aspect that you consider, figures tell us that after the (nuclear deal), there is more space for movement and progress," he said.
"We need to wait two or three more days," he said.
Registration for the elections begins tomorrow and will continue until Saturday.
Sitting presidents in Iran are expected to be modest about their ambitions, and to refrain from using state television as a campaigning platform.
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