The Institute for Supply Management released its non-manufacturing purchasing managers' index for the U.S. on Monday. The index fell to 56.9 in September from 59.0 in August, missing expectations for a decrease to 58.0.
A reading above 50 indicates a growth in the service sector.
The decline was driven by falls in prices, business activity/production and new orders indices.
The business activity/production index declined to 60.2 in September from 63.9 in August.
The ISM's new orders index decreased to 56.7 in September from 63.4 in August.
The ISM's employment index rose to 58.3 in September from 56.0 in August.
The prices index dropped to 48.4 in September from 50.8 in August.