Market participants remained very cautious with the outcome of the elections in Greece up in the air. Opinion polls showed a tight race between the pro-bailout and anti-bailout parties.

The markets will also get several reports on the U.S. economy on the day. 

The New York Federal Reserve's regional manufacturing gauge plunged to 2.29 in June from 17.09 in May, a significantly worse reading than the 13 expected. Readings above zero point to expansion while those below indicate contraction. A separate report from the Fed showed U.S. industrial production fell 0.1% in May from the month before, worse than the 0.1% gain that was expected. 

A preliminary reading on consumer sentiment for the month of June checked in at 74.1, down from 79.3 in May and lower than the 77.5 economists were expecting, according to a survey by Thomson Reuters and the University of Michigan.

Commodity futures were modestly higher.