I have never been so relieved to see a set of traffic cones in my life. After a three-hour drive from Pula Airport, during which I confidently ignored the satnav twice and once found myself in what I am fairly certain was someone's olive grove, I finally spotted the holiday park entrance in Medulin. The cones were not, as it turned out, marking the entrance. They were surrounding a drainage ditch that I very nearly reversed into while trying to turn around. My partner sat in silence, which I have learned is worse than shouting.

We had booked a mid-September week, chasing that sweet spot the travel brochures call "shoulder season." What they do not tell you is that your shoulder will absolutely need a cardigan. The Istrian coast in September trades the July crush for something far more interesting: a kind of golden, melancholy hush. The temperature hovers around twenty-two degrees, warm enough to pretend it is still summer but honest enough to remind you that it is not.

The property itself sat in a quiet residential area, the sort where local dogs bark at you not with aggression but with genuine curiosity about your life choices. Our terrace faced east, which meant breakfast in proper sunlight and a slow retreat into shade by mid-afternoon. I had packed for beach weather. I wore the same hoodie four days running.

The pool, still open but no longer heated, became a daily test of character. The first morning I stood at the edge for a full seven minutes, working up the nerve. A German gentleman in his sixties strode past, said "Gruss Gott," and executed a perfect dive without breaking stride. I still have not forgiven him. The water was not cold, exactly. It was decisive. It made you choose between dignity and comfort, and I consistently chose comfort, entering via the steps like a pensioner with hip concerns.

The seasonal shift shaped everything. The beach at Belvedere, ten minutes' walk away, had that lovely abandoned-festival quality. The sun loungers stood in orderly rows, half of them stacked, the other half occupied by a few determined souls reading books in windbreakers. The sea, though. The sea in September is something else entirely. Clear as gin, and somehow more serious than in high summer. I swam out further than I would have dared in July, partly because the absence of jet skis made me feel brave, partly because the cold water on my face kept me alert enough to remember which direction was shore.

Evenings required planning. By half past six the sun dropped behind the pines, and the temperature fell with it. We took to cooking on the terrace grill, buying squid and sardines from the small harbour market that only opens mornings now, the fishermen no longer bothering with afternoon hours. The tomatoes, though. September tomatoes in Istria are August's tomatoes that have been allowed to think about things. Deeper flavour, almost too intense, as if they know their time is limited.

What struck me most was the rhythm. In July this coast demands performance. You must swim, you must socialise, you must justify the expense and the heat. September lets you off. We walked to the old town most evenings, past the shuttered ice cream parlours and the one stubborn bar still serving outside under propane heaters. The locals reappeared, reclaiming benches and pavements from the tourist economy. An elderly man fed stray cats near the church. We watched him three nights running, never speaking, and I found myself envying his schedule, his apparent completeness.

On our final morning I woke early, the light doing that particular September thing where everything looks slightly more real than usual. I made coffee and sat outside in my hoodie, listening to the first dogs, the distant fishing boats. The pool lay still, untouched, already holding the day's first chill. I thought about that olive grove, the drainage ditch, the German gentleman's effortless dive. I thought about how I had come chasing summer and found something better: a season that knows itself, that asks nothing and offers everything quietly.

I did not swim that morning. I just sat there, properly cold, properly content, watching the light move across the terrace until my coffee went cold too.