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European shares have started August 2026 in almost the opposite way to what their seasonal reputation would suggest.

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The EURO STOXX 50 and DAX are hovering near record highs, while the CAC 40 remains close to its peak. Yet August has historically been one of Europe’s weakest months.

That contradiction raises a more interesting question than whether investors should simply “sell in August”.

The data suggests August is not consistently a bad month. Instead, its poor reputation has been shaped by a small number of extraordinary market shocks.

European markets are defy ‘August curse’

European shares have started August 2026 in almost the opposite way to what their seasonal reputation would suggest.

The EURO STOXX 50 and DAX are hovering near record highs, while the CAC 40 remains close to its peak. Yet August has historically been one of Europe’s weakest months.

That contradiction raises a more interesting question than whether investors should simply “sell in August”.

The data suggests August is not consistently a bad month. Instead, its poor reputation has been shaped by a small number of extraordinary market shocks.

Germany’s DAX, which tracks the 40 largest companies on the Frankfurt exchange, tells the same story going back to 1970.

August has averaged a loss of 1.03%. September has averaged a loss of 1.64%.

France’s CAC 40, which tracks the 40 biggest companies in Paris, has data going back to 1988. August has averaged a loss of 1.22%. September has averaged a loss of 1.38%.

Three different countries, three different stretches of history — and exactly the same ranking. September worst, August second.

Yet August 2026 has looked nothing like that.

On 11 August, the EURO STOXX 50 closed at an all-time high above 6,560 points, up roughly 13% since the start of the year. The DAX moved above 26,450 for the first time, while the CAC 40 finished around 8,740 points.

So who is right — the calendar or the market?

The short answer: the calendar has a much weaker case than it appears.

The average August is not the typical August

An average is only useful when the numbers around it are relatively similar.

Picture five people walking into a room. Four earn €30,000 a year, one earns €1 million. The average income in that room suddenly looks far higher than what most people actually take home.

August equity returns have a similar problem. A handful of extreme crashes drag the long-term average sharply lower.

That is where the median becomes useful. It is simply the middle observation once every August return is ranked from worst to best, so half the years sit below it and half above — a better guide to what a typical August actually looks like.

For the EURO STOXX 50, the median August return is -0.19%, a very different picture from the -1.42% average. The typical August has been close to flat.

Five Augusts explain the damage

Most of the damage comes from five extraordinary episodes.

In August 1998, the EURO STOXX index fell 14.44% as Russia defaulted on domestic debt and devalued the rouble.

In August 1990, it dropped 13.82% after Iraq invaded Kuwait. August 2011 brought a 13.79% fall as the eurozone debt crisis intensified around Italy and Spain. In August 1997, the index lost 9.99% as the Asian financial crisis spread across the region, and in August 2015 it fell 9.19% when China devalued the yuan.

These were not ordinary corrections. They were global shocks that happened to land in August.

Strip out those five years and the EURO STOXX 50’s average August return flips from -1.42% to +0.17%. Five years out of 39 turn a seemingly weak month into a slightly positive one.

Why can August amplify a shock?

The explanation may have less to do with the month itself than with how markets function during the summer.

Europe effectively goes on holiday in August. Trading desks thin out and fewer investors are actively setting prices. That does not cause a sell-off on its own, but it can make markets more sensitive once one begins.

There are also fewer scheduled monetary-policy decisions. The European Central Bank’s latest meeting was in July, with its next scheduled decision not due until September.

The US Federal Reserve follows a similar summer gap, leaving markets with fewer major policy events to anchor expectations at precisely the moment liquidity is thinnest.

Then there is Jackson Hole. The Federal Reserve’s annual conference in Wyoming, held later in August, can become a major market event in its own right, particularly when investors are hunting for clues on interest rates.

This year’s gathering carries extra weight: it is Kevin Warsh’s first Jackson Hole address as Fed chair.

August therefore combines three potentially volatile ingredients: thinner liquidity, fewer scheduled policy events, and the possibility of a significant central bank signal arriving late in the month.

What makes August 2026 different?

The historical pattern is only useful if investors understand what has changed.

European equities entered August at or near record highs, underpinned by strong earnings expectations. Reuters reported that analysts had raised expectations for second-quarter earnings growth across the STOXX 600 to almost 21%, up from 12.5% in May — giving markets a fundamentally stronger backdrop than the historical average would suggest.

But there is another side to the ledger. The Middle East energy shock remains a risk for Europe: higher energy prices could push inflation back up while squeezing consumers and corporate margins at the same time.

Eurozone inflation eased to 2.8% in June, down from 3.2% in May, though a fresh energy shock could complicate the path back to the European Central Bank’s 2% target.

That leaves an unusual setup heading into the rest of the month.

So should investors fear August?

The historical record does not say European stocks must fall this month. In fact, the EURO STOXX 50 and DAX have both finished August higher almost half the time.

What history does show is more subtle: August is not necessarily Europe’s seasonal crash month. It is a month in which rare shocks have historically produced unusually large losses. That distinction matters in 2026.

Investors do not need to predict whether August will end higher or lower. The more useful question is whether markets, having just reached record highs, are sufficiently prepared for an unexpected shock arriving while liquidity is thin.

That is what the August pattern is really warning about — not a calendar effect, but a vulnerability.