Euribor at 12 months closes September at an average of 3.238%, compared to 2.172% a year ago. The annual review of a €150,000 mortgage over 25 years increases by €86.8 per month.
Euribor at 12 months closes September 2026 with an average of 3.238%, according to data published by euribor.com.es. This figure represents an increase of more than one percentage point from 2.172% in September 2025 and leaves the index well above last year's levels.
In today's session, the index has decreased by 27 basis points to 3.329%, a drop that does not offset the overall upward trend for the month.
For variable mortgages, the effect is direct. On a €150,000 mortgage over 25 years with a 1% margin and annual review, the payment rises from €849.81 to €936.6, representing a monthly change of €86.8. If the review is semi-annual, the payment increases from €881.17 to €936.6, with a monthly rise of €55.4.
The calendar of the European Central Bank marks the next appointment. The Governing Council meets approximately every six weeks, usually on Thursdays, and the next meeting will be on 29 October in Frankfurt. After each meeting, the decision is published and there is a press conference with the president and vice-president. In March, June, September, and December, the ECB also presents its updated macroeconomic projections.
Euribor, short for Euro Interbank Offered Rate, is the interest rate at which major European banks lend money to each other. It is published daily and serves as the benchmark for most variable mortgages in Spain, meaning that when it rises, the monthly payment also increases; and when it falls, it decreases accordingly.
Although the figure is published daily, the value that affects mortgages is the monthly average of the 12-month Euribor. There are other terms, such as the 6-month or 3-month Euribor, which are used in variable mortgages in other European countries.

