The headline index fell 40 basis points to 51.5 during the month, below preliminary reports for a 51.9 reading.
Minutes away from the first major data point of the week: U.S. PMI.
The reading, from research firm Markit Economics, is expected to remain in line with a preliminary reading of 51.9 released earlier this month.
At that level, it would represent moderate growth in the country's manufacturing sector — a report above 50 indicates expansion.
The release is scheduled for 8:58 a.m. ET.