According to a report by the Commerce Department, retail sales in the U.S. in August declined 0.2% compared to the previous month.
Analysts had predicted an increase of 0.1%.
In July, retail sales rose 0.3% (revised from +0.6%).
Over the last 12 months the index rose by 3.2%.
Excluding car sales, retail sales in August rose 0.2% after rising 0.4% a month earlier (revised from +0.5%).
Analysts had forecast growth in August increased by 0.5%.