Euribor climbs to 3.247% in September 2026, reaching highest level since July 2024

September rate climb and historical context

The 12-month Euribor, the main benchmark for variable-rate mortgages in Spain, ended September 2026 with a monthly average between 3.233% and 3.247%, depending on preliminary market calculations. This figure marks the third consecutive monthly increase for the index and represents its highest level since July 2024, when it stood at 3.526%. The September reading is higher than the 2.954% registered in August 2026, a month in which the daily index crossed the 3% threshold for the first time since September 2024. During September 2026, the daily Euribor continued to rise, reaching a peak of 3.379% on 25 September. The monthly average remains subject to final confirmation by the Banco de España.

Household mortgage impact and repayment increases

The annual climb directly increases repayment obligations for borrowers whose loans reset against the September benchmark. In September 2025, the index closed at between 2.172% and 2.187%, creating a year-on-year gap of more than 106 basis points. For an average mortgage of 150,000 euros with a 25-year term and a margin of Euribor plus 1%, financial comparator Roams calculates that monthly payments will rise from approximately 725 euros to 809 euros, adding 84 euros per month or 1,010 euros per year. HelpMyCash estimates that the same loan will increase by 88 euros per month, resulting in an annual extra cost of 1,054 euros, with monthly instalments reaching 813 euros. Loans with semiannual revisions from March 2026, when the index was 2.565%, face an increase of 55 to 57 euros monthly, translating to between 329 and 340 euros per half-year. For a 300,000-euro loan over 25 years with the same spread, the extra annual cost reaches 2,100 euros.

ECB monetary policy and inflation pressures

The upward trajectory follows monetary tightening by the European Central Bank and rising inflation across the eurozone. On 10 September 2026, the ECB raised interest rates by 25 basis points to 2.50%, representing its second rate hike of the year following an earlier increase in June. Eurozone inflation reached between 3.2% and 3.3% in August 2026, driven by rising energy costs linked to the war involving Iran and the United States in the Middle East. Financial analysts at HelpMyCash stated that expectations of additional ECB rate hikes have caused the interbank index to adjust upward before official policy decisions occur.

As forecasts point to several ECB rate increases over the coming months, the index has moved ahead and climbed above 3%.

Banking offers and market expectations

Market pricing indicates that investors anticipate additional monetary tightening over the next twelve months, with financial participants projecting a rate hike in December 2026 and potentially one or two further increases in the first quarter of 2027. Pablo Vega of Roams noted that the twelve-month rate has detached from the current official deposit facility rate of 2.50%.

The most striking aspect is that the Euribor is running clearly well ahead of the official ECB rate. With the deposit facility at 2.50% and the twelve-month Euribor around 3.3%, the market is already pricing in considerable monetary tightening over the next twelve months.

In the mortgage origination market, commercial banks adjusted interest rates upward across successive rounds between April and June, as Middle East tensions affected energy markets. According to iAhorro, banks paused these price increases during September 2026, keeping their commercial mortgage offers unchanged while observing market movements.

September, on the other hand, has been a month of containment. For now, most institutions have chosen to maintain their prices.