Each year, the turning of the seasons arrives not as a single moment but as a negotiation between forces — and this week, Britain finds itself in the middle of that ancient bargain. Monday offers a last warm exhale of summer, with southern England touching 26°C under a permissive jet stream, before that same atmospheric river straightens and accelerates, ushering in the cooler, wetter rhythms of autumn by Thursday. The shift is not a crisis but a recalibration — the weather returning to what September has always meant. What lies beyond, whether summer musters one final stand or yields entirely