A warm start to the week is expected to be replaced by wetter and windier conditions as the weather takes on a more autumnal character.
The shift is being linked to a stronger jet stream, which is set to play a greater role in shaping conditions during the week. That change is expected to bring a marked contrast with the milder opening spell, with more unsettled weather becoming the main feature.
The outlook points to a week in which early warmth does not last, giving way instead to conditions more typical of autumn. The emphasis is on a transition rather than a settled warm period, with rain and wind becoming more prominent as the week develops.
There is also a question over whether a September heatwave could emerge later in the month. However, the available forecast material does not confirm that such a spell is expected, and the immediate focus remains on the move towards wetter and windier weather.
The latest known outlook is therefore for a warm beginning to the week followed by a more changeable and autumnal pattern, driven by the strengthening jet stream.
