GoogleCore UpdateConfirmed
September 2019 core update
Broad core update that Google pre-announced and that tracking tools recorded as milder than the March and June 2019 releases.
What changed
Google announced the September 2019 core update on the day of release and pointed publishers to its existing guidance rather than issuing anything new. Third-party volatility trackers recorded a smaller spike than for the two previous 2019 core updates, and some sites affected in earlier updates recovered. No completion date was announced.
Timing
Rollout began 24 September 2019. No completion date was announced. Rankings typically remain unstable for the whole rollout window, so measurements taken inside it are not a reliable read on the outcome.