Euro slides as markets weigh ECB rate hike against Middle East tensions

The euro resumed its decline against the dollar in European trading on Wednesday, slipping to $1.1660 from an opening level of $1.1674 and erasing the previous session's marginal advance. The move came even as a Reuters report, citing three unnamed policymakers, indicated that the European Central Bank is preparing to raise its deposit rate by a quarter point at its 9-10 September meeting. In normal circumstances, an anticipated tightening cycle supports a currency. This time, the single currency barely reacted before resuming its slide.

What the Reuters report actually says

According to the agency's sources, who spoke on condition of anonymity because the discussions are confidential, ECB policymakers believe the time has come for another increase. Inflation is running at around 3%, the Iranian conflict continues to threaten energy supplies, and the eurozone economy is showing enough resilience to absorb higher borrowing costs. The hike, from 2.25% to 2.50%, was already incorporated into the assumptions underlying the ECB's June projections. The sources stressed that the move would likely signal determination to avoid a repeat of the post-2022 inflation surge rather than open the door to a sustained tightening cycle.

That last point matters. The ECB raised rates for the first time in nearly three years in June, breaking a long pause that began in 2019. The decision then was driven by the energy shock following Russia's invasion of Ukraine. Now, with the Iranian war adding a fresh layer of geopolitical risk, the central bank faces a familiar dilemma: tighten to anchor expectations, but not so aggressively that it chokes the recovery. The sources said policymakers will have a clearer picture when August inflation data are released next week, followed by updated staff projections at the September meeting.

Money markets move, but the euro does not follow

The market's immediate reaction was measurable. Overnight index swaps shifted the implied probability of a 25-basis-point September hike from 50% to 75%. That is a significant repricing in a single session. Yet the euro failed to capitalise. One reason is that the repricing merely brought forward expectations that had been building since June. Another is that the dollar side of the pair is moving on its own dynamics. The US Dollar Index rose 0.1% as long-term Treasury yields climbed, reflecting renewed bets that the Federal Reserve may still raise rates this year. The July Personal Consumption Expenditures report and second-quarter GDP figures, both due later on Wednesday, will test those bets.

Safe-haven demand for the dollar is also a factor. The Iranian conflict, while currently de-escalating militarily after the US opted for sanctions over strikes, remains a source of uncertainty. Oil prices fell more than 3% on Tuesday on the news, but the risk premium has not vanished. In periods of geopolitical stress, the dollar tends to benefit regardless of interest-rate differentials. The euro, by contrast, is seen as more exposed to Middle Eastern energy shocks given Europe's import dependence.

The Iranian variable

The source text refers to an "Iranian war" and "Iranian conflict" as a driver of both the ECB's thinking and market sentiment. This is a notable shift in language. Since the 2022 invasion of Ukraine, European central bankers have been acutely sensitive to energy-driven inflation. The Iranian situation, whatever its precise military status, threatens to keep oil and gas prices volatile. The ECB's June projections assumed a certain energy price path. If the conflict disrupts supply routes through the Strait of Hormuz, those assumptions could be rendered obsolete.

The US decision to pursue economic sanctions rather than military strikes eased immediate supply fears, hence the oil price drop. But sanctions take time to bite and can create their own market distortions. European policymakers will be watching whether Iranian crude finds alternative buyers, at what discount, and whether OPEC+ responds. The ECB's September projections will need to incorporate a range of scenarios, not a single baseline.

Inflation data and the September decision

The next flash estimate for eurozone inflation, due in the first week of September, will be the last hard data point before the Governing Council meets. Headline inflation has been sticky around 3%, well above the 2% target. Core inflation, which strips out energy and food, has been slower to decline. Wage growth, another key metric for the ECB, has remained robust in several large economies. The sources cited by Reuters noted that the eurozone economy is showing "signs of resilience", a phrase that in central banking parlance often means growth is strong enough to withstand higher rates.

But resilience is a relative concept. The eurozone grew 0.3% in the first quarter of 2026 and 0.2% in the second, according to Eurostat's preliminary estimates. That is not a boom. Manufacturing PMIs have been contracting for months. Services have held up, but consumer confidence remains fragile. A rate hike in September would take the deposit rate to its highest level since the financial crisis. The transmission lag means the full effect of the June increase has not yet fed through to credit conditions. Adding another quarter point now is a judgment call, not a mechanical response to data.

Dollar strength and the Fed wildcard

The euro-dollar pair is, ultimately, a relative game. The Federal Reserve has held its policy rate at 5.25-5.50% since July 2023. Markets have repeatedly priced in cuts, only to push them out as US inflation proved stickier than expected. The PCE report due Wednesday is the Fed's preferred inflation gauge. A hot reading would revive rate-hike bets for the Fed's September or November meetings, widening the yield gap with the eurozone. Even if the ECB hikes, a simultaneous Fed hike, or a delayed Fed cut, would limit euro gains.

US second-quarter GDP, also due Wednesday, adds another layer. The Atlanta Fed's GDPNow model has been tracking around 2.5% annualised growth, suggesting the US economy remains on a solid footing. Strong growth with sticky inflation is the classic recipe for a hawkish Fed. European investors know this. The euro's failure to rally on the ECB news reflects a market that has learned not to front-run central banks in isolation.

What the ECB's June hike actually achieved

It is worth recalling what happened after the June increase. The ECB raised the deposit rate from 2.00% to 2.25%, its first move since 2019. The euro initially strengthened, touching a three-month high above $1.17 in early August. But the rally faded as US data surprised to the upside and Middle East tensions flared. Bank lending surveys showed credit standards tightening further, but loan demand from firms remained weak. The real economy impact is still unfolding. The ECB's own models suggest monetary policy operates with a 12-18 month lag. By that metric, the June hike will not be fully felt until mid-2027.

This lag is central to the September debate. Hawks argue that policy must be forward-looking: if inflation is projected to stay above target in 2025 and 2026, waiting risks entrenching expectations. Doves counter that the lag means past hikes are still working their way through, and overtightening carries asymmetric risks. The Reuters sources suggest the hawks have the upper hand for now, but the decision is not yet locked in.