Greggs has warned that its full-year profits may fall slightly below 2024 levels after extreme summer heat dampened footfall and slowed sales in June.

In a first-half trading update, the bakery chain reported total sales of £1.03bn for the 26 weeks to 28 June 2025, up 6.9% year on year.

Like-for-like sales in company-managed shops grew 2.6%, buoyed by stronger trading in May, but Greggs said progress had slowed noticeably in June as soaring temperatures led to fewer customer visits, despite a noticeable uptick in cold drink sales.

The business said the challenging weather conditions have prompted the board to revise its outlook, warning that full-year operating profit could now come in “modestly below” last year’s level.

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“Sales momentum continued into May but the high temperatures in June presented a headwind to footfall,” the company said. “While we are mitigating costs and remain confident in our plans, current trading conditions have led us to revise our expectations for the year.”

The update comes as Greggs pushes ahead with its ambitious expansion strategy. It opened 87 new shops during the period and closed 56, resulting in a net addition of 31 and taking its estate to 2,649 locations. The group said it remained on track to achieve 140 to 150 net new openings this year.

It added that refurbishment efforts were also front-loaded into the first half, with 108 shop refits completed so far this year and around 50 more planned for the second half of the financial year.

Meanwhile Greggs said cost inflation pressures remained broadly unchanged, but expected efficiencies and cost recovery initiatives to bolster performance in the second half.

Earlier this year, Greggs debuted a new ‘eco’ drive-thru on Easton Lane in Winchester as it aims to ramp up sustainability and reduce its overall environmental footprint.