Never mind finishing above 15°C, the last GFS run called into question finishing above 14°C!
The 12z gives me a final CET estimate in the high 13s - but it's a particularly cool run for next Friday onward.
The 06z led to a low 14s estimate and to my eyes, the 12z ECM looks to be headed along a similar path as of day ten.
Much like with August, there's a cool-warm-cool shape to the month unfolding. Also like that month, the degree of error for be looks to me mainly down to the magnitude of warmth during the middle phase - though it's not out of the question that something like the GFS 12z unfolds and makes the cool final phase the main source of error instead. We are in a La Nina now, after all - mid-Atlantic ridges have boosted odds.