Waitrose July total divisional sales excluding fuel were up 7.2 per cent, as customers stocked up on products to help them cool off in the heat.
Shoppers bought a record amount of ice cream with sales up 74 per cent during the week.
Beers, wines and spirits were up by 16.9 per cent.
The outdoor living category saw a record week with sales up 65 per cent. Sales of charcoal rose 120 per cent, outdoor toys by 300 per cent and sales of BBQ meat were up 45 per cent.
Longacres garden centre IT manager Mike Ainley said July sales were "helping make up for June without a doubt".
He said sales had increased turnover, with gardem furniture among items reduced.
Ainley said: "It goes to show when sun comes out everyone wants to be in their gardens."
Ayletts said last weekend has been particularly good, with sales improved in July.
Beckworth Emporium's Mike Easom said; "June wasn’t the greatest month but July has been fantastic for sales."