The Weather Outlook

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fairweather
20 June 2026 15:36:59
Are there still any dramatic thunderstorms forecast in the outlook?
S.Essex, 42m ASL
Ally Pally Snowman
20 June 2026 15:37:36

The MetO raw now has 38s west of London on Wednesday, and some 36s/37s on Thursday - that amber warning surely has to be extended tomorrow!

https://weather.metoffice.gov.uk/forecast/gcpszc12r#?date=2026-06-20 

And the Arpege is utterly bonkers tonight. Just the French charts available so far, but that's two days of 40 in the UK...

https://images.meteociel.fr/im/31/17504/arpege_31_78_0acz8.png 

UserPostedImage

https://images.meteociel.fr/im/96/9852/arpege_31_102_0wjl7.png 

UserPostedImage

Originally Posted by: Retron 

Just staggering,  would beat the June record by 4c . Nuts


Bishop's Stortford 85m ASL.
Matty H
20 June 2026 16:41:29

I am also fed up with how politicised hot weather has become. On one side you have alarmism trying to link literally any weather event to catastrophic climate change. On the other hand you have the GB News brigade claiming that it was much hotter in the past and all new temperature records are fake. 

Clearly the British climate  is getting warmer at a rapid rate, whatever the causes. I just hope that if a new temperature record is set it’s not at bloody Heathrow. 

Originally Posted by: Rob K 

There or Kew Gardens. Regardless of what anyone says to me, it’s not just coincidence that takes top spot most days in any hot spell. Something that’s not just the actual weather impacts the readings there 


Yate, Nr Bristol

TBFTEIARBSC

Rob K
20 June 2026 16:41:47

The MetO raw now has 38s west of London on Tuesday, and some 36s/37s on Wednesday - that amber warning surely has to be extended tomorrow!

https://weather.metoffice.gov.uk/forecast/gcpszc12r#?date=2026-06-20 

And the Arpege is utterly bonkers tonight. Just the French charts available so far, but that's two days of 40 in the UK...

https://images.meteociel.fr/im/31/17504/arpege_31_78_0acz8.png 

UserPostedImage

https://images.meteociel.fr/im/96/9852/arpege_31_102_0wjl7.png 

UserPostedImage

Originally Posted by: Retron 

The Met Office auto now has 38, 36, 34 for Tuesday to Thursday for my location.

BBC goes for 34, 35, 34. So still no agreement on which is the hottest day.

And FWIW it already feels really warm this evening now the sun has broken through, when it is only 25C!

BTW Darren the zoomable Arpege charts are up and show 40C around Bedford on Tuesday and in Somerset and Gloucestershire on Wednesday. It also has a small area with MINIMA of 28C in Somerset overnight Wed-Thu, and 27s quite widely. And 850mb temperatures hit 26C.


Yateley, NE Hampshire, 73m asl

"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome

Matty H
20 June 2026 16:46:56

Are there still any dramatic thunderstorms forecast in the outlook?

Originally Posted by: fairweather 

Hopefully not, and I don’t know why anyone would celebrate them. They could start a wildfire or hit a tree or an elderly lady


Yate, Nr Bristol

TBFTEIARBSC

Brian Gaze
20 June 2026 16:51:13

The MetO raw now has 38s west of London on Tuesday, and some 36s/37s on Wednesday - that amber warning surely has to be extended tomorrow!

https://weather.metoffice.gov.uk/forecast/gcpszc12r#?date=2026-06-20 

And the Arpege is utterly bonkers tonight. Just the French charts available so far, but that's two days of 40 in the UK...

https://images.meteociel.fr/im/31/17504/arpege_31_78_0acz8.png 

UserPostedImage

https://images.meteociel.fr/im/96/9852/arpege_31_102_0wjl7.png 

UserPostedImage

Originally Posted by: Retron 

👍Arpege 2m tmax / tmin are stepped at 3 hour intervals (I think) regardless of where you source them. On Wednesday the thinned grid for the UK is showing 41C. I don't have time to check out the full grid to see if there's a 42C hiding away.

UserPostedImage


Brian Gaze

Berkhamsted

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Brian Gaze
20 June 2026 16:59:11
Still a few problems with the new DWD grib packing, but the 12Z ICON-EU is now available. It shows 37C on Tuesday and 34C on Wednesday. IMO, it often very good.

 UserPostedImage

UserPostedImage


Brian Gaze

Berkhamsted

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scillydave
20 June 2026 17:03:44

👍Arpege 2m tmax / tmin are stepped at 3 hour intervals (I think) regardless of where you source them. On Wednesday the thinned grid for the UK is showing 41C. I don't have time to check out the full grid to see if there's a 42C hiding away.

UserPostedImage

Originally Posted by: Brian Gaze 

The Arpege charts are insane. The location of the heat in particular will exacerbate problems. London might get the odd day in the high 30s but Bristol and Cardiff definitely don't. Cardiff's all time record is 33.5c - that would be smashed by roughly 5c on these charts. Bristol might hit 40c for gods sake.

Clearly it's one run at 3 or 4 days out and very unlikely to verify as is but it's just extraordinary nonetheless. 


Currently living at roughly 65m asl North of Cowbridge in the Vale of Glamorgan.

Formerly of, Birdlip, highest village in the Cotswolds and snow heaven in winter; Hawkinge in Kent - roof of the South downs and Isles of Scilly, paradise in the UK.

Retron
20 June 2026 17:51:35
Note just the Arpege which is insane.

The MetO raw this morning (at half six) for Tuesday for here, then at half five this evening and again just now...

UserPostedImage  UserPostedImageUserPostedImage

Yes, that's gone up by 9 poxy degrees in the space of half a day. Utterly bonkers!

Heathrow is now showing 39C on Tuesday on the MetO raw.


Leysdown, north Kent
BYF1
  • BYF1
  • Advanced Member
20 June 2026 18:07:04
UKV 12z s showing 38 - 40c for Thames valley across to Bristol Channel for Thursday @ T120. I think Tuesday is going to to be hottest for down this way with SE flow. 
North downs, near Folkestone, 177m asl.
Quantum
20 June 2026 18:18:56
I think this could be the most extreme heatwave the UK has ever seen, unlike 2022 this isn't just one day of those highest possible temperatures either.


25/26 (850hpa temp) 11 days snow/sleet falling

18/11 (-4) 19/11 (-6) 20/11 (-6) 01/01 (-7) 04/01 (-10) 10/01 (-7) 11/01 (-3) 30/01 (-1) 13/02 (-6) 15/02 (-4) 18/02 (-6)

24/25 10d

18/11 (-6) 19/11 (-6) 23/11 (-2) 22/12 (-5) 04/01 (-5) 05/01 (0)14/02 (0) 15/02 (0)12/03 (-6) 13/03 (-6)

23/24 8d

29/11 (-6) 30/11 (-6) 02/12 (-5) 03/12 (-5) 04/12 (-3) 16/01 (-3) 18/01 (-8)08/02 (-5)

22/23 7d

18/12 (-1)06/03 (-6) 08/03 (-8) 09/03 (-6) 10/03 (-8) 11/03 (-5) 14/03 (-6)

21/22 12d

TimS
  • TimS
  • Advanced Member
20 June 2026 18:19:56

There or Kew Gardens. Regardless of what anyone says to me, it’s not just coincidence that takes top spot most days in any hot spell. Something that’s not just the actual weather impacts the readings there 

Originally Posted by: Matty H 

Even without a city there you'd expect the hottest temperatures in the UK in what's now London. Especially West London. Very close to sea level, in the SE corner, sheltered from marine influence by the downs and Surrey Hills. It's microclimatically ideal.

Heathrow is often top in straight southerlies. It has the Surrey hills and the highest part of the North Downs directly to its South. Dewpoints there often dip suddenly in those Southerlies, as famously they did in 2003. This is the mini Foehn Darren mentions in relation to East Kent too 


Brockley, South East London 30m asl
Brian Gaze
20 June 2026 18:23:24
Ouch!

UserPostedImage


Brian Gaze

Berkhamsted

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Crepuscular Ray
20 June 2026 18:23:35
Hope you all get through the impending heatwave ok. I see the area of hell has been extended to Nottingham where my family live

I think Edinburgh will still be warm 23-26 C maybe but more cloud and threat of rain


Jerry

Edinburgh, in the frost hollow below Blackford Hill

Quantum
20 June 2026 18:36:28
I should just point out the CAPE values are also exceptional. And there is frontal activity while this is all happening. If massive lightning storms kick off then obviously we won't see these insane temperatures.


25/26 (850hpa temp) 11 days snow/sleet falling

18/11 (-4) 19/11 (-6) 20/11 (-6) 01/01 (-7) 04/01 (-10) 10/01 (-7) 11/01 (-3) 30/01 (-1) 13/02 (-6) 15/02 (-4) 18/02 (-6)

24/25 10d

18/11 (-6) 19/11 (-6) 23/11 (-2) 22/12 (-5) 04/01 (-5) 05/01 (0)14/02 (0) 15/02 (0)12/03 (-6) 13/03 (-6)

23/24 8d

29/11 (-6) 30/11 (-6) 02/12 (-5) 03/12 (-5) 04/12 (-3) 16/01 (-3) 18/01 (-8)08/02 (-5)

22/23 7d

18/12 (-1)06/03 (-6) 08/03 (-8) 09/03 (-6) 10/03 (-8) 11/03 (-5) 14/03 (-6)

21/22 12d

Quantum
20 June 2026 18:56:54
UserPostedImage

All time thickness record in the UK is 578dm


25/26 (850hpa temp) 11 days snow/sleet falling

18/11 (-4) 19/11 (-6) 20/11 (-6) 01/01 (-7) 04/01 (-10) 10/01 (-7) 11/01 (-3) 30/01 (-1) 13/02 (-6) 15/02 (-4) 18/02 (-6)

24/25 10d

18/11 (-6) 19/11 (-6) 23/11 (-2) 22/12 (-5) 04/01 (-5) 05/01 (0)14/02 (0) 15/02 (0)12/03 (-6) 13/03 (-6)

23/24 8d

29/11 (-6) 30/11 (-6) 02/12 (-5) 03/12 (-5) 04/12 (-3) 16/01 (-3) 18/01 (-8)08/02 (-5)

22/23 7d

18/12 (-1)06/03 (-6) 08/03 (-8) 09/03 (-6) 10/03 (-8) 11/03 (-5) 14/03 (-6)

21/22 12d

Heavy Weather 2013
20 June 2026 19:09:19

UserPostedImage

All time thickness record in the UK is 578dm

Originally Posted by: Quantum 

Darren will fall of his chair when he sees that 579 over the UK is astonishing. 


Mark

Beckton, E London

Less than 500m from the end of London City Airport runway.

Matty H
20 June 2026 19:17:34

I think this could be the most extreme heatwave the UK has ever seen, unlike 2022 this isn't just one day of those highest possible temperatures either.

Originally Posted by: Quantum 

You were asking what the hype was about on the model thread a couple of days ago 


Yate, Nr Bristol

TBFTEIARBSC

Jiries
20 June 2026 19:25:38

Ouch!

UserPostedImage

Originally Posted by: Brian Gaze 

Until now the app having none of it, it been so insisting we not getting a major heatwave just cloudy, rainy and temps only up to 31C when most charts and other people showing their apps show full sunshine mid 30's and high 30's over SE.  I still expecting full sunshine from tomorrow onward and rising temperatures to low 30's.  That single 37C I see is over west of Birmingham area.

Rob K
20 June 2026 20:13:14
Never mind the June record, it now seems there’s a serious chance of the all-time record being broken. 

I certainly wouldn’t have thought in July 2022 that we’d see 40C again in less than 4 years time but I honestly wouldn’t be surprised. The charts just seem to keep getting hotter. 


Yateley, NE Hampshire, 73m asl

"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome

Ally Pally Snowman
20 June 2026 20:17:35
ECM 12z from tomorrow 

31c, 31c, 34c, 37c, 37c, 34c, 29c


Bishop's Stortford 85m ASL.
Heavy Weather 2013
20 June 2026 20:20:22

ECM 12z from tomorrow 

31c, 31c, 34c, 37c, 37c, 34c, 29c

Originally Posted by: Ally Pally Snowman 

And we know that tends to underestimate as well.


Mark

Beckton, E London

Less than 500m from the end of London City Airport runway.

Heavy Weather 2013
20 June 2026 20:21:47

Never mind the June record, it now seems there’s a serious chance of the all-time record being broken. 

I certainly wouldn’t have thought in July 2022 that we’d see 40C again in less than 4 years time but I honestly wouldn’t be surprised. The charts just seem to keep getting hotter. 

Originally Posted by: Rob K 

Could need a historic heat watch thread. Can’t believe this could be the third in 7 years.


Mark

Beckton, E London

Less than 500m from the end of London City Airport runway.

Heavy Weather 2013
20 June 2026 20:51:09
MetO app now has this for London

Mon: 32C

Tues: 39C

Wed: 37C

Thu: 36C

Fri: 32C


Mark

Beckton, E London

Less than 500m from the end of London City Airport runway.

Matty H
20 June 2026 21:41:25

MetO app now has this for London

Mon: 32C

Tues: 39C

Wed: 37C

Thu: 36C

Fri: 32C

Originally Posted by: Heavy Weather 2013 

Be amazing if we can smash 40c+ again. Really really hope we do it 

I’ve been on this forum since the start and recall convos where it was stated there was no chance we’d break 40c in the UK 


Yate, Nr Bristol

TBFTEIARBSC

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