Euribor rises to 3.247% in September and makes variable mortgages more expensive
The one-year Euribor, the index used to revise most variable-rate mortgages, closed September 2026 with an average of 3.247%, compared with 2.954% in August and 2.172% a year ago, according to the Banco de España.
The one-year Euribor, the index used to revise most variable-rate mortgages, stood at an average of 3.247% in September 2026, according to data published by the Banco de España.
What it means for mortgage holders
The figure affects people with a variable-rate mortgage loan whose revision falls on these dates: as the index rises, the instalment they pay is recalculated upwards. The Euribor has risen for two months in a row and stands well above the level of a year ago.
Three months of rises
The August 2026 average was 2.954%, so the index has gained just over three tenths in a month. The comparison with September 2025 is steeper: back then the Euribor stood at 2.172%, which means more than one percentage point of difference in twelve months.
The Banco de España publishes these monthly values on its interest rate statistics page, where the full series can be consulted.
To check the figure
The monthly series of the one-year Euribor is available on the Banco de España website, in the interest rate statistics section: the Banco de España interest rate statistics.