Highest temperature in Madrid on September 11?

What this question means

Madrid on 11 September: 31°C at 64%, 30°C at 25%, 32°C at 13%, and effectively nothing below 29°C.

That is a confident distribution for a European city, and the contrast with Milan on this board — which peaks at just 34% — is worth drawing. Both are continental southern Europe in early September, yet one is priced nearly twice as sharply.

The difference is where each sits. Madrid is on a high inland plateau with reliably dry late summers, which produces settled conditions and repetitive daily highs. Milan sits in the Po Valley, closer to Alpine influence and more exposed to autumn systems arriving from the north.

Notice too that the floor is hard. Nothing at 28°C or below registers at all, while the warm side retains some weight. Inland Iberia in September has a dependable baseline of heat, and the residual uncertainty is almost entirely about how far above it the day lands.