A sequence rather than one settled week
The Met Office's 10 September trend described a changeable early-autumn pattern across the UK as low- and high-pressure systems alternated. That brings periods of rain and showers, but also brighter and drier intervals. A broad “wet week” label would miss the useful gaps between fronts, while a single sunny day would not prove the pattern had settled.
What a ten-day trend can tell you
At this range the large-scale pattern is more reliable than the exact hour a front reaches a particular town. Western and northern areas often encounter Atlantic systems first, but the location and duration of heavier rain can be revised closer to the day. Short-range local forecasts and any weather warnings should guide travel plans.
This article reflects the Met Office outlook published 10 September. It does not claim that every forecast rain band occurred exactly as described.