Rival Inbev UK had already announced prices rises of 3.3% for similar reasons.
Coors chief executive Mark Hunter said: “We are seeing input cost inflation of a magnitude that could cripple the UK beer industry.
“Barley has gone up by more then 40% in the last year.
“It is no longer tenable to fully absorb the rate of input cost inflation and, after much deliberation, the company needs to make an extraordinary price increase of 3p a pint from Sept 29.
“These are extraordinary times for beer.
“We recognise the pressures facing brewers and beer retailers alike and we will continue to work with our customers to attack costs and create beer value through building great beer brands.”
The move affect a portfolio that includes Carling and Grolsch.