Google Search in September 2026: No Core Update Yet, But AI Overviews Just Got Bigger

September opened quietly on Google's Search Status Dashboard - no new core update, no new spam update - but that's not the same as nothing happening. On 27-28 August, Google confirmed that AI Overviews can now expand automatically into a longer, AI Mode-style answer, removing the manual "Show More" button for some queries. Days earlier, a separate but related change began rolling Google's generative UI - the feature that builds custom visual layouts and interactive tools on the fly - out of AI Mode and into AI Overviews too.

Neither of these is a ranking algorithm update. Both are interface changes that affect how much of the page a searcher sees before they ever reach a website. For UK businesses relying on organic traffic, that arguably matters more this month than a confirmed core update would.

Here's what's actually confirmed, what isn't, and what to check on your own site before the month is out.

What Google has confirmed so far in September

As of 1 September, the Search Status Dashboard lists the August 2026 spam update as the most recent confirmed ranking event. It ran from 18 to 21 August, taking roughly two days and 16 hours to complete, and was Google's third confirmed spam update of the year following one in June. No broad core update has been announced for September. The only two confirmed broad core updates so far in 2026 remain the March update and the May rollout, which ran from 21 May to 2 June.

That doesn't mean rankings are sitting still. Google has repeatedly said its search systems update continuously in ways that are never individually announced, which is exactly why rankings can shift even in a month with no confirmed update at all. Google's John Mueller has previously clarified that the company tries to announce a confirmed rollout as close as possible to when it actually begins, rather than sitting on a named update quietly for days beforehand.

2026 confirmed updates so far

The real story: AI Overviews can now expand automatically

Google confirmed the behaviour on 27-28 August: AI Overviews can dynamically expand into a longer, more detailed answer, resembling the presentation style of AI Mode, for queries where its systems judge a fuller answer is more useful. The manual "Show More" control disappears in these cases, though Google says the expansion cancels itself if a searcher starts scrolling past it toward the results below. Google's own framing is that this is a win for users, saying its research shows people find Search more helpful and engage in more follow-up exploration when it happens.

For businesses depending on the click-through from that first page, the practical effect is more screen space taken up by Google's own generated answer before a searcher ever reaches a blue link. This isn't a small-scale shift, either. Independent tracking has put AI Overview presence at roughly 48% of tracked queries as of early 2026, up 58% year on year, with healthcare, education, and B2B technology queries most affected. Separate analysis of AI Mode specifically found only around 4.5% of sessions end in a click to an external website, compared with roughly 24% for traditional search.

A few weeks before the dynamic expansion news, Google separately confirmed it was rolling its generative UI feature out of AI Mode and into AI Overviews too, as part of a back-to-school push that also added practice quizzes and study-notebook tools. Generative UI builds custom visual layouts, interactive tools, and simulations directly inside the AI response. Google said full availability in AI Overviews was expected within weeks of that announcement. The two changes are related in spirit, both making AI Overviews behave more like AI Mode, but they were confirmed separately and shouldn't be treated as the same event.

What this means depending on your query types

What to check on your own site this month

• Look at Search Console CTR by query, not just position. A page ranking well but sitting on a low CTR, common on informational queries right now, is a sign AI Overviews may already be intercepting clicks before they reach you.
• Check which of your pages are already being cited inside AI Overviews for your target terms, where visible. Being the source Google pulls from matters more under dynamic expansion than the position of your blue link beneath it.
• Prioritise queries where an AI Overview is least likely to fully answer the question. Local, transactional, and highly specific queries remain harder for Google to satisfy with a generated summary alone, and are still where organic clicks convert best.
• Don't chase this month's non-event. With no confirmed core update, large ranking swings are more likely to be normal fluctuation, a lingering effect of the August spam update, or Google's usual continuous, unannounced tweaks than anything worth a reactive rewrite.

The takeaway

September 2026 is a reminder that "no update" doesn't mean "no change." The ranking algorithm is quiet for now, but the interface searchers actually see keeps shifting underneath it, and AI Overviews' growing ability to fully answer a query without a click is arguably a bigger threat to organic traffic than most confirmed core updates have been this year. If your content strategy is still built purely around ranking position, this is the month to start tracking citations inside AI Overviews too.

Jack Harrison is Founder & Director of Harri Digital, a Plymouth-based digital product studio and agency, and a member of the Institute of Fundraising.