The Office for National Statistics will publish its August monthly gross domestic product estimate at 7:00am London time on Wednesday, giving the first official read on whether Britain’s summer growth streak extended into late summer or began to cool as energy bills and mortgage costs climbed again.

Economists polled ahead of the release have centred on a 0.4% month-on-month increase for August, according to market summaries circulating on Wednesday morning. That would match July’s pace, when services, production and construction all contributed to a 0.4% rise after June’s 0.3% gain. The ONS has not pre-released the August number; its bulletin page still listed the release as unpublished at the time of writing.

What July already showed

In the bulletin released on 11 September, the ONS said real GDP grew 0.4% in July and 0.4% across the three months to July compared with the three months to April — the eighth consecutive quarter-on-quarter three-month expansion in that series. Services output rose 0.4% in July, production 0.2% and construction 0.1%. The agency noted that retail footfall softened in August in its forward-looking indicators, coinciding with less favourable weather, while fuel demand growth eased as pump prices moved higher.

For businesses filing VAT returns and for Treasury officials watching tax receipts, the August print matters because it closes the third quarter of the calendar year on a month that typically captures back-to-school spending, late summer tourism and the tail end of the holiday booking season. A miss against consensus would land just as Bank of England officials debate how much of the recent energy shock will pass through to core inflation.

Why traders are watching

Sterling traded softer against the dollar on Tuesday after Chief Economist Huw Pill questioned whether markets were right to price four quarter-point Bank rate increases over the next year. A stronger-than-expected GDP figure could complicate that debate by suggesting domestic demand is holding up despite higher borrowing costs. A flat or negative month would feed the opposite argument — that rate-sensitive sectors are finally slowing.

The ONS will also update its three-month-on-three-month growth rate, which smooths volatile monthly swings. That measure has been steady at 0.4% in recent releases, a pace that is respectable by post-pandemic standards but far from the rapid rebounds seen in 2021 and 2022.

Household and corporate context

Survey data from the ONS’s Business Insights and Conditions Survey, cited in the July bulletin, showed economic uncertainty remained the most commonly reported challenge affecting turnover among trading businesses, though the share reporting it eased slightly from earlier waves. Energy and input costs continue to feature in manufacturing commentary, particularly for firms exposed to European gas benchmarks that have risen on Middle East shipping disruption.

Chancellor-facing forecasters at the Office for Budget Responsibility will incorporate today’s figures into their next round of projections. While a single month rarely shifts the fiscal outlook on its own, a run of soft prints would reduce the headroom for pre-election spending pledges that both major parties have begun to sketch in private.

What happens next

Retail sales for August follow on 18 October, offering a consumption lens on the same period. The Bank’s Monetary Policy Committee next meets in early November, by which time September CPI and labour market data will also be on the table. For now, the August GDP release is the marquee domestic data point of the morning — and the one that sets the tone for how City economists describe the UK economy heading into the final quarter of 2026.