The survey of 752 respondents across the manufacturing, retail and service sectors showed a reading of +14 per cent in the three months to June, compared with +33 per cent in May. This slowdown was largely due to last month's fast pace of growth in business and professional services not being sustained.
Nonetheless, expectations are buoyant, with respondents anticipating that growth will bounce back in the next three months (balance of +32 per cent).
However, the BDO High Street sales tracker saw like-for-like retail sales fall by -2.0 per cent in June.
Performance by sector:
Lifestyle: -2.0 per cent
Fashion: -1.9 per cent
Homewares: -3.9 per cent
Non-Store: +21.8 per cent
This monthly performance report is based on the aggregated retail weekly sales of 85,000 non-food medium sized retailers with 10,000 individual stores.
Garden centres have had a better time, with Alton Garde Centre reporting a record June for outdoor sales as better weather prolonged the season.
CBI economics director Rain Newton-Smith said: "Despite an easing in performance this month, activity over the quarter as a whole has been good. We expect the economy to sustain a solid pace of growth over the remainder of the year as lower oil prices and inflation continue to boost real incomes and consumer spending."