The Scottish soft drinks company has reported that total revenue between February 1 to May 29 increased 22.5% compared to the same period last year.
Like for like sales, excluding the effect of its Rubicon acquisition, rose 7.9%.
AG Barr says the integration of the Rubicon business, which began in January, is helping to offset the impact of weak sterling.
In a statement, the company says: “Sales in the latter half of May have benefited from improved weather however they are up against some strong weather driven comparables from last May.
“Our increased portfolio coverage and our strong operating focus continues to give us confidence that we will deliver our plans despite the current difficult economic environment.”
In March last year AG Barr entered into a conditional agreement to purchase Rubicon, the UK-based manufacturer and distributor of juice drinks, negotiating an initial cash payment of £59.8m.
This month, AG Barr launched a £1m ad campaign to support its Strathmore Twist brand, a new range of flavoured still and sparkling spring waters.
The drinks company has also signalled its intention to bolster the marketing activity of its flagship soft drink brand Irn-Bru in England.