Bank of England | Database Export source data
| Date | Monthly average Sterling overnight index average (SONIA) rate [a] IUMASOIA |
|---|---|
| 31 Jan 10 | 0.4545 |
| 28 Feb 10 | 0.4672 |
| 31 Mar 10 | 0.4713 |
| 30 Apr 10 | 0.4726 |
| 31 May 10 | 0.4842 |
| 30 Jun 10 | 0.487 |
| 31 Jul 10 | 0.49 |
| 31 Aug 10 | 0.491 |
| 30 Sep 10 | 0.501 |
| 31 Oct 10 | 0.5083 |
| 30 Nov 10 | 0.5086 |
| 31 Dec 10 | 0.5173 |
| 31 Jan 11 | 0.5059 |
| 28 Feb 11 | 0.5084 |
| 31 Mar 11 | 0.5154 |
| 30 Apr 11 | 0.524 |
| 31 May 11 | 0.5217 |
| 30 Jun 11 | 0.5311 |
| 31 Jul 11 | 0.5228 |
| 31 Aug 11 | 0.538 |
| 30 Sep 11 | 0.5486 |
| 31 Oct 11 | 0.5358 |
| 30 Nov 11 | 0.5347 |
| 31 Dec 11 | 0.5201 |
| 31 Jan 12 | 0.5157 |
| 29 Feb 12 | 0.4993 |
| 31 Mar 12 | 0.49 |
| 30 Apr 12 | 0.4861 |
| 31 May 12 | 0.4848 |
| 30 Jun 12 | 0.4859 |
| 31 Jul 12 | 0.4646 |
| 31 Aug 12 | 0.45 |
| 30 Sep 12 | 0.4271 |
| 31 Oct 12 | 0.4334 |
| 30 Nov 12 | 0.4256 |
| 31 Dec 12 | 0.4309 |
| 31 Jan 13 | 0.4097 |
| 28 Feb 13 | 0.4261 |
| 31 Mar 13 | 0.4353 |
| 30 Apr 13 | 0.4396 |
| 31 May 13 | 0.4336 |
| 30 Jun 13 | 0.4252 |
| 31 Jul 13 | 0.4301 |
| 31 Aug 13 | 0.427 |
| 30 Sep 13 | 0.4299 |
| 31 Oct 13 | 0.4313 |
| 30 Nov 13 | 0.43 |
| 31 Dec 13 | 0.4215 |
| 31 Jan 14 | 0.4287 |
| 28 Feb 14 | 0.4197 |
| 31 Mar 14 | 0.4159 |
| 30 Apr 14 | 0.422 |
| 31 May 14 | 0.4233 |
| 30 Jun 14 | 0.4251 |
| 31 Jul 14 | 0.4283 |
| 31 Aug 14 | 0.4228 |
| 30 Sep 14 | 0.4319 |
| 31 Oct 14 | 0.4308 |
| 30 Nov 14 | 0.4325 |
| 31 Dec 14 | 0.428 |
| 31 Jan 15 | 0.4355 |
| 28 Feb 15 | 0.4511 |
| 31 Mar 15 | 0.4568 |
| 30 Apr 15 | 0.4574 |
| 31 May 15 | 0.462 |
| 30 Jun 15 | 0.4566 |
| 31 Jul 15 | 0.4549 |
| 31 Aug 15 | 0.459 |
| 30 Sep 15 | 0.4544 |
| 31 Oct 15 | 0.4622 |
| 30 Nov 15 | 0.4636 |
| 31 Dec 15 | 0.4575 |
| 31 Jan 16 | 0.4659 |
| 29 Feb 16 | 0.4657 |
| 31 Mar 16 | 0.4646 |
| 30 Apr 16 | 0.4663 |
| 31 May 16 | 0.4633 |
| 30 Jun 16 | 0.4598 |
| 31 Jul 16 | 0.4577 |
| 31 Aug 16 | 0.2478 |
| 30 Sep 16 | 0.213 |
| 31 Oct 16 | 0.212 |
| 30 Nov 16 | 0.2108 |
| 31 Dec 16 | 0.2125 |
| 31 Jan 17 | 0.2135 |
| 28 Feb 17 | 0.2106 |
| 31 Mar 17 | 0.2095 |
| 30 Apr 17 | 0.2114 |
| 31 May 17 | 0.2126 |
| 30 Jun 17 | 0.2121 |
| 31 Jul 17 | 0.2124 |
| 31 Aug 17 | 0.2132 |
| 30 Sep 17 | 0.2123 |
| 31 Oct 17 | 0.211 |
| 30 Nov 17 | 0.4493 |
| 31 Dec 17 | 0.4619 |
| 31 Jan 18 | 0.4631 |
| 28 Feb 18 | 0.4634 |
| 31 Mar 18 | 0.4637 |
| 30 Apr 18 | 0.4617 |
| 31 May 18 | 0.4529 |
| 30 Jun 18 | 0.4507 |
| 31 Jul 18 | 0.4545 |
| 31 Aug 18 | 0.6911 |
| 30 Sep 18 | 0.7012 |
| 31 Oct 18 | 0.7011 |
| 30 Nov 18 | 0.7017 |
| 31 Dec 18 | 0.7026 |
| 31 Jan 19 | 0.7053 |
| 28 Feb 19 | 0.7061 |
| 31 Mar 19 | 0.7053 |
| 30 Apr 19 | 0.7081 |
| 31 May 19 | 0.7094 |
| 30 Jun 19 | 0.7085 |
| 31 Jul 19 | 0.709 |
| 31 Aug 19 | 0.7101 |
| 30 Sep 19 | 0.7098 |
| 31 Oct 19 | 0.7108 |
| 30 Nov 19 | 0.7105 |
| 31 Dec 19 | 0.7101 |
| 31 Jan 20 | 0.7113 |
| 29 Feb 20 | 0.7104 |
| 31 Mar 20 | 0.3192 |
| 30 Apr 20 | 0.0659 |
| 31 May 20 | 0.0674 |
| 30 Jun 20 | 0.0646 |
| 31 Jul 20 | 0.0599 |
| 31 Aug 20 | 0.0562 |
| 30 Sep 20 | 0.0547 |
Notes:
[a] On 23 April 2018, SONIA was reformed. For further information on the changes made, see the `Background on SONIA reform' section of the following page: www.bankofengland.co.uk/markets/sonia-benchmark