Still nothing much here - just 15mm so far for September. Downpours all around in the last week but mostly missing us. 

25C in the south or 23C in Birmingham is not a record just standard Sept warm spell.  The record still at 35C so no chance to break it.

Now the recent showers/storms have cleared its back to the same old. Temperature above average and not much happing 

Hope this chart isn't a sign of the coming winter 

https://www.meteociel.fr/modeles/ecmwf.php?ech=240&mode=1&map=0&type=0&archive=0

No doubt once October rolls round and set ups like 

https://www.meteociel.fr/modeles/ecmwf.php?ech=96&mode=1&map=0&type=0&archive=0

this would be welcome, the Atlantic will awaken from its slumber. 

As the Met Office say its statistical convenience. 

So your welcome to use the equinox statistics if you wish. 

Exactly. Neither are wrong and both can be used in different contexts. According to the Met Office, autumn starts on September 23rd this year ....

When does autumn start? - Met Office 

In terms of weather and temps, this breakdown is just a valid in my opinion. 

Jan/Feb/Mar = Winter

Apr/May/Jun = Spring

Jul/Aug/Sept = Summer

Oct/Nov/Dec = Autumn 

March is spring here nowadays. Mostly the first proper warmth. There are odd exceptions (BFTE)

Even late Feb can feel spring-like now and often does 

That's another thing it verrys alot from North to South in the UK.  That's why a 3 month segment starting the 1st of each month makes it much more simple for the UK overall. 

Why some care what start date is used for each season baffles me. 

Dec/Jan/ early Feb = winter 

Mid Feb/ March/ Apr/ early May = spring

Mid May/June/Jul/Aug/ First half SEP = summer

Late sep/Oct/Nov = autumn 

Temp summary: the battle between cooler air from the NE and warmer air on Atlantic coasts continues, though neither much below or above norm respectively. By comparison with yesterday, the cooler air succeeds in advancing to E France & the shores of the Med in week 2, S Britain and W France hanging on to the last of the warmth. Rain in a ring around Poland which is itself dry in week 1; the ring expands as does the drier area at its centre in week 2, the latter then centred on Channel coasts up to Denmark.

GFS Op: as before Danielle dying off NW Spain with trough to S Britain Tue 13th, and Earl dying mid-Atlantic. Then a period with HP to W of Ireland and LP centred in Baltic and N-lies for Britain, until Mom 19th when the HP moves E-wards but hangs on, situated in the northern  N Sea while a broad trough develops from Spain to Greenland by Sun 25th. LP then controls the N Atlantic but not a dartboard low as shown yesterday, just a trough extending S over UK Wed 28th.

GEFS : in the S, warm with a little rain at first, dropping to cool Fri 16th and steadily back to norm Wed 21st, very dry during this period, perhaps a little rain from Mon 26th. ENs members good agreement. The N misses out on the early warmth and rain, and with more disagreement in ens members from 26th but probably cooler and wetter at this time.

ECM: similar to GFS but HP situated more to south in N Sea Wed 21st so W-lies rather than S-lies at this time

Yes, I think that fits well for the southernmost part of Great Britain, including here in Kent.

Agreed. The need to segment into 3 month blocks seems to occupy people too much 

What record potential is there? The date record is over 30C and there's surely no danger of that being broken?

It's an irrelevance.

I think, when you're a parent and the return to school is the beginning of September, it neatly ties off the summer mindset. So summer ending at the end of August fits from a psychological perspective.

Also, I find the weather's usually better in June. And there's the long days, too. It's dark around 8 now - hardly summery! (and that's with the artificially later sunset times through BST)

I've always thought of June as a summer month and September as an autumn month. It's convenient and more accurate.

June, July & August = summer

September to May = autumn

that true there no winter season at all, that only called winter for UK latitude is snow, ice and sub-zero days but without that Autumn persist and it been boring Autumnal since late August this year so hope to get some decent sunny days then get warmer during Queen funeral date onward so that welcome. to keep heating off 100% in Sept.  Very soon we will see what October bring but hope to be a repeat of 1995 October as it been well over due for warm Oct since 2011.

There was a story on my Windows feed, but its clear the date record is safe, but night time temp will be high, perhaps that is the record they were talking about

Also valid. Though temp wise, I think potential minima plays a factor in people's perceptions as well. Low temps and frosts only rarely occur from late June/July thourgh to early Aug, but become more frequent from the end of Aug up until late May or early June even. Grant it, late Aug and Sept can also record some of the warmest nights of the year as well. 

I'd be happy with that TBH – also matches the business quarters which are often called by those names as shorthand (winter quarter, spring quarter etc)

Frost down here is nonexistent from late April (usually mid) and doesn't return in until October - athough frostless Octobers are not unusual. May is actually a rather unpredictable month here as it's the month that we transition into overnight double digit lows, but the timing can be anywhere from the first week to the last week. For growing tomatoes I usually wait until the end of the second week before planting outside.

Not sure about that – if you look at record highs I think September holds the whip hand over June, quite easily. 

It actually warmed up here after midnight with an overnight low of 18.4C which for mid September is impressive. Probably not a record breaker though.

Going by the last few years, I think you could amend that to include frostless Novembers