Federal Reserve Gov. Jerome Powell said Wednesday the labor market continues to look solid, but he's undecided whether interest rates should be raised next month for the first time in nine years.

"First-half growth looks a little stronger now after the first quarter was revised up. Second quarter was reasonably good. The labor market continued to be strong," he told CNBC's "Squawk Box." But, he added, inflation was still "well below" the Fed's targets.