The government on Wednesday revised upward the July reading of the key gauge on the current state of the economy to 90 percent from 88.9 percent.
The revised reading of the coincident index reflects a rise in the manufacturing industry's plant operation rate, the Cabinet Office said in an update of preliminary figures.
A reading below 50 percent is considered a sign of economic contraction and a figure above that is viewed as a sign of expansion.
The government has also revised upward the index of leading indicators, a measure of economic growth about six months ahead, to 70 percent from 66.7 percent due to an increase in machinery orders, the office said.
The index of lagging indicators, which gauges economic performance in the recent past, was left unchanged at 50 percent.