The Weather Outlook

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Charmhills
29 June 2026 07:58:17
Temps in China, where I'm heading in a couple of days, are in the mid to high 30s with high humidity and high dew points.

Although with thundery showers around🌩️


Loughborough, EM.

Knowledge is power, ignorance is weakness.

Duane.

Jiries
29 June 2026 08:22:18

I do , but 41c is a bit much especially when you got to work. Most other output has mid 30s next week . Looks like a spell very similar to last week .

Originally Posted by: Ally Pally Snowman 

Better to work shift pattern so you get more days off during the week to catch those hot spells easier.  I seen the ensembles and there some few support with the main op up to 22c here.  It been a trend to show high temps for a while and not in FI.

Rob K
29 June 2026 08:25:26

I think this coming warmer spell could be more pleasant with lower humidity/dew points for the UK.

Originally Posted by: Charmhills 

BBC Weather here has basically unbroken sun from July 3rd to 12th, with highs between 26 and 32 and lows of 13 to 18. Sounds wonderful. Wish I had invested in solar panels though, I have really been missing out these last couple of years!


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

The Beast from the East
29 June 2026 09:05:06
ECM extended 00z looks like a standard heatwave rather than extreme. the block doesnt drag up those reds and then drifts west back and forth.  I could live with that.
Purley, Surrey, 70m ASL

"We have some alternative facts for you"

Kelly-Ann Conway - former special adviser to the President

The Beast from the East
29 June 2026 09:07:11

Temps in China, where I'm heading in a couple of days, 

Originally Posted by: Charmhills 

Why are you going to China? 


Purley, Surrey, 70m ASL

"We have some alternative facts for you"

Kelly-Ann Conway - former special adviser to the President

Charmhills
29 June 2026 09:10:31

Why are you going to China? 

Originally Posted by: The Beast from the East 

For a bit of travelling and something different.


Loughborough, EM.

Knowledge is power, ignorance is weakness.

Duane.

Rob K
29 June 2026 10:34:00
A relatively chilly GFS run, only maxing out at 39C. 

Edit: actually on the third 39C day it looks like there is a 40C isotherm. Oh well... :)

So just the one 40C+ day, six 35C+ and twelve 30C+ days on that run.


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

Quantum
29 June 2026 11:04:55
I think its clear that for these extreme heat scenarios the usual rule of 'find the highest possible pixel of heat and that will probably be the max recorded at the hottest station' is a little out. Both now and in 2022 the temperatures predicted were excessive, and although in both cases there was downward adjustment even in the short term they exaggerated the highs.

In 2022 the GFS ensembles had something like a 50% chance of 41C being achieved 1-2 days before the actual event, in the end we were about a degree lower than that; some of the more extreme forecasts went far above 42C with the most extreme one showing 46C. 

We currently have forecasts showing 40C again, thankfully I think unless we get a big majority of ensembles showing this at short range its probably quite unlikely. 


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

Rob K
29 June 2026 11:16:04

I think its clear that for these extreme heat scenarios the usual rule of 'find the highest possible pixel of heat and that will probably be the max recorded at the hottest station' is a little out. 

Originally Posted by: Quantum 

The recording network is so sparse now that I'm actually surprised how close the recorded max often is to the modelled max. The small areas of extremes are often over the top, as you say. (although I am pretty sure there were some reliable 38s across Norfolk on Friday, looking at the private stations on WOW).


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

Chunky Pea
29 June 2026 12:12:59

 'find the highest possible pixel of heat'

Originally Posted by: Quantum 

Oddly poetic, Q. 


Patrick,

East Galway, Ireland.

Bertwhistle
29 June 2026 12:22:59
I very much hope so. Still not fully recovered from sleepless nights in the week just gone.

I notice one day in about a week's time, a mid 30s temperature with a 6C dewpoint. Keep hydrated then it might be possible to cool off.


Bertie, Itchen Valley.

Retire while you can still press the 'retire now' button.

Rob K
29 June 2026 13:06:56
GEFS 6Z now up to 16 members with 20C at 850mb in London. At least three of them go for 41C...
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

Rob K
29 June 2026 17:10:33
Another consistently hot run from GFS 12Z with at least 12 days of low to mid 30s albeit without the crazy 40Cs this time. Still a marked north south split though with the heat not really making it to northern parts except a couple of brief wafts.
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

Brian Gaze
29 June 2026 17:17:31
GFS 12Z wants to get the party started even earlier.

UserPostedImage


Brian Gaze

Berkhamsted

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Heavy Weather 2013
29 June 2026 17:27:32

GFS 12Z wants to get the party started even earlier.

UserPostedImage

Originally Posted by: Brian Gaze 

One thing we won’t go into this next heatwave is damp ground as well. In effect we are back in Heatwave territory from Friday on this run alone, meaning in reality the ‘cool down’ was only for 4 days 


Mark

Beckton, E London

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

TimS
  • TimS
  • Advanced Member
29 June 2026 18:05:11

Another consistently hot run from GFS 12Z with at least 12 days of low to mid 30s albeit without the crazy 40Cs this time. Still a marked north south split though with the heat not really making it to northern parts except a couple of brief wafts.

Originally Posted by: Rob K 

It’s an awful forecast for France, in the hot sense of the word. We’ll be at our Burgundy house from later in the month but relatives will be there next week, and it looks thoroughly unpleasant for them. 38+ most days, a few 40s. That’s just not holiday weather.


Brockley, South East London 30m asl
Rob K
29 June 2026 18:42:06

GEFS 6Z now up to 16 members with 20C at 850mb in London. At least three of them go for 41C...

Originally Posted by: Rob K 

And 17 on the 12Z. P25 and P2 the furnace specials with six days 36C+ in a row (including two 40s on P25).


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

White Meadows
29 June 2026 22:03:02
Looking more and more certain we get some kind of hot blast next week now. Confidence obviously increasing as we approach the weekend. 
Rob K
29 June 2026 22:42:16

Looking more and more certain we get some kind of hot blast next week now. Confidence obviously increasing as we approach the weekend. 

Originally Posted by: White Meadows 

And sure enough the 18Z GFS throws out a much cooler run! It’s all relative though and would still be a great summer run in most years…

Edit: and still gets to 38C eventually. As I said it’s all relative 🙂


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

fairweather
30 June 2026 00:19:51
Last couple of days have been great, 25C, drier air and a breeze. If only more weekends could have been like this when I was playing cricket. Usually cold and or wet for a lot of weekends. Although I was playing not that far from Brogdale the day it broke the record in the days when a broken heat record wasn't a weekly event! We used to take the kids to the beach if it ever got to 70F which was the yardstick for beach sunbathing provide it didn't go behind a  big Cumulus cloud which it variably did!
S.Essex, 42m ASL
Ally Pally Snowman
30 June 2026 07:04:18
Anyone south of a line Aberystwyth to Hull the outlook looks hot. Slightly flatter setup means those further north maybe more mixed. 
Bishop's Stortford 85m ASL.
DEW
  • DEW
  • Advanced Member
30 June 2026 07:13:32
FAX - fronts from the west this week; weak and decaying today, more active Thu 2nd driven by LP 999mb Orkney, even a trailing front across Scottish borders Fri 3rd (wasn't shown yesterday) as pressure rises from the SW, 1033mb Sat 4th off Brittany.

GFS Op 0z - picks up the HP from Fax and keeps it near SW England ca 1025mb to Thu 8th with Atlantic air in its circulation for Britain (looks fine and warm but not dramatically hot). From then to Mon 13th Britain lies in a region of slack pressure, LP in France nibbling at the S Coast (on the fringe of continental heat) while the north of Scotland has fresh westerlies from LP near Iceland. From Mon 13th the LP transfers to Scandinavia and a northerly drift brings cooler weather for all, though the Azores High continues to lurk to the SW.

ECM to T+240 - agrees with GFS

AIFS - London, steady rise in maxima from 23C now to 32C Thu 9th before dropping back to 25C, dry to Tue 14th. Edinburgh, maxima in upper teens for the next fortnight, a short burst of warmth (21C) Wed 8th, trending cooler towards the end. Appreciable rain in the coming two days, small amounts of 'nuisance' rain after that.

GEFS - mean temp quite well supported by ens members showing a rather warm spell (6C above norm in the south, 4C above in north) Thu 8th - Sun 12th, but close to norm either side of this. Dry in the south, grading to light rain from time to time in the north. 


It's not the voting that's democracy, it's the counting - Tom Stoppard

Chichester 12m asl

Rob K
30 June 2026 07:32:30
0Z update: 13 runs plus the op hitting 20C at 850mb. Looks to me as though there is a slight wobble away from a serious heatwave this morning - still very warm but the northward extent of the heat is getting cut off.

Having said that, P14 is one for the scrapbook! 

UserPostedImage


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

Bertwhistle
30 June 2026 07:35:27

0Z update: 13 runs plus the op hitting 20C at 850mb. Looks to me as though there is a slight wobble away from a serious heatwave this morning - still very warm but the northward extent of the heat is getting cut off.

Originally Posted by: Rob K 

Rob take a look at P14 Saturday 11th around Norfolk!


Bertie, Itchen Valley.

Retire while you can still press the 'retire now' button.

Rob K
30 June 2026 07:38:43

Rob take a look at P14 Saturday 11th around Norfolk!

Originally Posted by: Bertwhistle 

Yes I was just editing my post with that one. Five consecutive 40C days from the 7th... 40, 40, 42, 44, 44.


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

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