3-month Euribor – September 2023
The average 3-month Euribor for September 2023 is 3.880 %, computed from 21 daily fixings (complete). The month opened at 3.770 %, closed at 3.952 %, with a low of 3.770 % and a high of 3.977 %. Versus August 2023 the average is up +0.100 pp.
Most variable mortgages in the euro area are revised on the monthly average, not the daily value. A loan that resets in September on the 3-month Euribor plus 1 pp would pay 4.88 % for the coming period.
Every number on this page is a published fixing, not an estimate: daily values come from the Bank of Finland's copy of the Euribor series, monthly averages are the arithmetic mean of those fixings and are cross-checked against the ECB Data Portal, and the tables are rebuilt each business day after the previous day's fixing appears. Tenors use the ACT/360 convention. Where a monthly average differs from the ECB figure by more than a hundredth of a point the methodology page lists the case.
What does it mean for a mortgage?
Annuity formula; assumes the rate applies for the whole remaining term. Your bank may round or use a different convention.
September 2023
Source: Bank of Finland. Published with a 24-hour delay.
Date
| Date | Rate | Change |
|---|---|---|
| 3.952 % | -0.003 pp | |
| 3.955 % | -0.017 pp | |
| 3.972 % | +0.031 pp | |
| 3.941 % | -0.036 pp | |
| 3.977 % | +0.019 pp | |
| 3.958 % | +0.003 pp | |
| 3.955 % | +0.021 pp | |
| 3.934 % | 0.000 pp | |
| 3.934 % | +0.031 pp | |
| 3.903 % | +0.025 pp | |
| 3.878 % | +0.011 pp | |
| 3.867 % | +0.022 pp | |
| 3.845 % | +0.021 pp | |
| 3.824 % | +0.002 pp | |
| 3.822 % | +0.022 pp | |
| 3.800 % | +0.001 pp | |
| 3.799 % | +0.004 pp | |
| 3.795 % | -0.007 pp | |
| 3.802 % | +0.004 pp | |
| 3.798 % | +0.028 pp | |
| 3.770 % | – |
Source: Bank of Finland. Published with a 24-hour delay.
Frequently asked questions
What is the 3-month Euribor average for September 2023?
3.880 %, computed from 21 daily fixings. The ECB's official monthly average is 3.880 %.
My mortgage revises with the September average – what rate applies?
Reference 3.880 % plus your contractual spread; with a 1 pp spread the new rate is 4.88 %. Check whether your contract uses the previous month or the month before that.
Source: Bank of Finland (daily fixings), ECB Data Portal (monthly averages). Published with a 24-hour delay. 07/09/2026