Footfall in September decreased by 1.2% compared to 2016, according to the British Retail Consortium (BRC).
High street footfall was down by 2.2% on the same month last year.
Retail parks saw a positive outcome with a 1.1% increase in footfall year on year.
The only region to welcome a greater number of shoppers during September compared to last year was the East which saw a 1.9% growth in footfall.
The deepest decline in footfall occurred in Northern Ireland (down 4.3%) and the South West (down 2.4%), while Scotland recorded its biggest dip since June 2016 at 2%.