Here Comes US Manufacturing PMI...

At 9:45 a.m. ET, we'll get Markit's final report on manufacturing PMI in May.

Economists estimate this index was 56.2 in May, up from 55.4 in April.

"The US manufacturing sector continued to gain strength heading into mid-year as supportive demand conditions led to the sharpest month-on-month increase in production for over three years," said Markit's Paul Smith in the preliminary report. "This provides further confirmation that industry will aid a rebound in U.S. GDP in the second quarter, and other indicators from the survey suggest that the sector has plenty of momentum heading into the summer and beyond."