16-dayer - UK still in cool pool into week 2 even as temps rampup in S Fance in an arc round to Germany. Rain generally week 1 confined to S England week 2 (with band continuing across the continent)

Jet stream - disconnected streaks across or near to the UK, fading out from Sat 5th

GFS - new trough moving in from the W Mon 24th, filling and moving to N Sea but hanging on just enough to prevent HP on the Atlantic from doing more than affecting fringes of UK through to Mon 31st when a more w-ly type of weather sets in. Finally LP over Spain Fri 4th teams up with Atlantic trough to give cold LP over UK Mon 7th

GEFS - as yesterday. cool and showery until about Fri 28th, then temp variation in runs either side of he norm, and less rainfall (tough contrary to 16-dayer, more rain in N)

ECM - is the one for optimists; it moves the stalled trough out of the way by Fri 28th followed by a few days of HP from a warm source centred over UK before LP over Europe starts to drift N Tue 1st

The same was true of my location as well, Caz.

April was very sunny and dry here, but with notable fewer really warm days compared to numerous other good Aprils we have had here in the past 20 years. The warmest temp we had here last month was 20.5C on the afternoon of the 15th. A number of other days got into the high teens, but the nights were noticeable cooler than we have experienced in April in many recent years.

Not the forecast I have seen " possibly 20c for BH weekend " was the comment 

Big ?s over the Bank Holiday weekend.

The trend towards lower pressure is clear. Easiest for me to post the Tweet.

MSLP data table from yesterday's GEFS 06z and today's 00z. Trend for #bankholidayweekend is for high pressure to be LESS influential than was looking likely https://t.co/xAOMBBaftc pic.twitter.com/dcYU9HzkgP

— TheWeatherOutlook (@TWOweather) May 22, 2021

Much better GFS 6z, but the model is all over the place atm so not sure it's much use.

Well the Schaff early this morning made no mention of any improvement for next week while previously they were almost 'promising' it. Was it a BBC forecast you saw?

This is an interesting question. I have been doing some reading on this subject.

1) The location and strength of tropical convection affects Northern Hemisphere circulation patterns in mysterious ways. It appears that there has been a particularly strong event in the Indian Ocean recently - See James Peacock [is he stormchaser on TWO?] on twitter for more detail

2) Atmospheric Angular Momentum [AAM], a measure of the rotation of the atmosphere around the Earth, has been negative for a lengthy period but is trending positive so some improvement in our weather is expected soon - see Matt Hugo on twitter for more detail

3) Low solar activity may also be playing a part

The good news re tropical convection is that periods of enhanced convection in particular locations tend to be followed by suppressed activity and vice versa.

Just doesn't get better than this 

Well it was the BBC News so I guess so , the comment of the BH weekend and warmer temps were the last comments 

ECM a week today , the Beeb must be going from this 

First week of June , GFS OP is at the lower end you have to say 

Whatever happens now, this will be the shortest summer in my lifetime. 

You don't actually feel you have had a respite from winter until you have had at least some of April and May with summer like weather.

Unless the weather improves through June and continues warm and sunny until October in which case you could call it a back loaded summer  

I don't think I have ever seen such weak signals for the medium to long range (which are never that strong to begin with). EC longer range keeps the NW of Europe temperature profile pretty tame right into the first week of June:

with the pressure pattern looking fairly ho hum. Much resolving to be done in the coming days me thinks. 

Now you watch ECM backtrack. It's written in the stars.

Whatever the models show still the only one way route to very overdue for warmth sunny and settled weather around.  Seem the cold are much stronger as it hit Death Valley, USA from 43C to 26C in late May, that very cool in my book for a normally low 40's average of this time of the year.  Any improvement would be wasted anyway as daylight will soon draw in within 4 weeks time. 

Aaaand, of course, GEM begins the backtrack just as GFS improves. It was so obviously going to happen. Having said that, the weekend looks decent at least.
Fully expect ECM to look rubbish tonight now. You can't make this up!!

 We had some warm days at the end of March. Not sure why you expect summer in Spring apart from a few short spells.