Fed Chairman Janet Yellen is concerned about sluggish wage growth, the still-elevated numbers of Americans working part-time even though they want full-time employment, and Americans still suffering from a long spell of joblessness.
While many of these metrics are improving, the U.S. central bank has pointed to these factors as evidence of a "significant underutilization" of labor market resources that merits a stimulative monetary policy.
"The Fed will be encouraged by the ongoing labor market improvement, but they are still wanting to see more marked progress in these measures to see that the labor market slack is being reduced," said Sam Bullard, a senior economist at Wells Fargo Securities in Charlotte, North Carolina.
Jobless rate seen falling
The unemployment rate is forecast declining one-tenth of a percentage point in August from 6.2 percent in July. Some economists, however, see a chance it could go up as brightening employment prospects lure some discouraged job seekers back into the labor force.
Average hourly earnings are expected to have increased 0.2 percent after being flat in July.
Read MoreJobs data may reveal more about Fed's next move
The jobs data will come ahead of a Fed policy meeting on Sept. 16-17. The central bank has kept benchmark lending rates near zero since December 2008 and financial markets do not foresee an increase until around the middle of next year.
The U.S. economy's better fortunes are in stark contrast with the struggling European economy. The European Central Bank on Thursday cut interest rates to a record low in an effort to stimulate growth.
U.S. employment gains in August were likely spread broadly across the economy.