The Weather Outlook

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westv
30 June 2025 09:07:48

Is this current heatwave being overhyped by the media? Yesterday was meant to reach 31c yet the max. was only 27c in East Malling. Can't see much chance of the June record going today or tomorrow then on that basis.

Originally Posted by: briggsy6 

That surprises me as the max here in Hull was 27c


Big heat in May

Summer will be spray.

Brian Gaze
30 June 2025 09:10:29

Is this current heatwave being overhyped by the media? Yesterday was meant to reach 31c yet the max. was only 27c in East Malling. Can't see much chance of the June record going today or tomorrow then on that basis.

Originally Posted by: briggsy6 

Not many things are 100% certain in weather forecasting, but I can give you a prediction with 100% certainty that a new June record won't be set tomorrow. Also, 31C was reached yesterday.


Brian Gaze

Berkhamsted

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"I'm not socialist, I know that. I don't believe in sharing my money." - Gary Numan

Rob K
30 June 2025 09:25:18

Is this current heatwave being overhyped by the media? Yesterday was meant to reach 31c yet the max. was only 27c in East Malling. Can't see much chance of the June record going today or tomorrow then on that basis.

Originally Posted by: briggsy6 

East Malling reached 29.3C yesterday, in fact.

And the overall UK max was 31.0C at St James's Park which was dead on the forecast max from most models.

I'm not sure about "overhyped" but the peak of the heat looks like being a couple of degrees lower than what the models suggested a day or two ago. Today 33 looks most likely, with maybe a 34 tomorrow. Put into context, if it reaches 34C then that will be hotter than any year in the entire 1960s, all but two years in the 70s and all but one year in the 80s. Nowadays it's just another warm spell: it's a rare year that doesn't reach 34!


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

briggsy6
30 June 2025 09:27:44

The stats in the Daily Mail weather section are wrong then.


Location: Uxbridge
Hungry Tiger
30 June 2025 09:47:25

I think the opposite,  the models are now picking up the next heatwave starting in about 10 days or so. 

Originally Posted by: Ally Pally Snowman 

I'm not surprised.  🙂🙂🙂


Gavin S. FRmetS.

TWO Moderator.

Contact the TWO team - [email protected]

South Cambridgeshire. 93 metres or 302.25 feet ASL.



MRazzell
30 June 2025 11:27:47
I actually really like the look of the 06z GFS this morning. SE Centric post but less warm from Wednesday then fine until the weekend where LP apparently introduces some showery weather here for a couple of days (lets see), and then mostly fine to the end of the run. Warm, usable weather, not too much wind, and little (edit) opressive heat - whats not to like? 
Far north of East Sussex. +150m asl.
Rob K
30 June 2025 11:35:48

I actually really like the look of the 06z GFS this morning. SE Centric post but less warm from Wednesday then fine until the weekend where LP apparently introduces some showery weather here for a couple of days (lets see), and then mostly fine to the end of the run. Warm, usable weather, not too much wind, and little (edit) opressive heat - whats not to like? 

Originally Posted by: MRazzell 

Yes it looks pretty good. Although some on here would argue about the lack of oppressive heat - plenty of 30C+ days in the southeast later in the 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

TheJudge
30 June 2025 11:46:02

East Malling reached 29.3C yesterday, in fact.

And the overall UK max was 31.0C at St James's Park which was dead on the forecast max from most models.

I'm not sure about "overhyped" but the peak of the heat looks like being a couple of degrees lower than what the models suggested a day or two ago. Today 33 looks most likely, with maybe a 34 tomorrow. Put into context, if it reaches 34C then that will be hotter than any year in the entire 1960s, all but two years in the 70s and all but one year in the 80s. Nowadays it's just another warm spell: it's a rare year that doesn't reach 34!

Originally Posted by: Rob K 

And this is where confusion arises. What defines  hot, warm, cooler, cool and mild?

If I was to believe some, June would have been a washout, cool temperatures and copious amounts of rain. Furthermore, summer has ended, trolling? WUM? Who knows but it’s starting to ruin my experience in the model output thread 😕

The true story is from the Midlands going south June has been fabulous (if you like this weather) , some clouds, warm to hot days, breezy and very very usable weather 

The outlook looks a little more mixed, but from what I understand some above average temperatures from the midlands south, some rain mixed in (although they do not seem to materialise as the models suggest recently). From my eyes I cannot see a washout or anything to suggest the whole of summer is over .

I’d put money on we will hit temps above 30 again in the next 2 weeks after it cools down to more normal summer temps from Wednesday.


Barby 551 ft above sea level
Rob K
30 June 2025 11:58:50
As Brian noted above, the cooldown this week is looking less cool.

GFS has 26C on Wednesday , 27C on Thursday and 28C on Friday before it freshens up at the weekend, with Sunday barely making it out of the teens. But that's a pretty brief blip as it's then back up to mid 20s by Tuesday, before another brief cooler interlude on Wednesday. Then it warms up again and it's 30C+ from next Friday till the end of the run.

And the op run is actually one of the cooler ensemble members in the 0-192hr period! (in fact THE coolest at days 7-9, in terms of London 2m temps!)


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

MRazzell
30 June 2025 12:01:41

Yes it looks pretty good. Although some on here would argue about the lack of oppressive heat - plenty of 30C+ days in the southeast later in the run!

Originally Posted by: Rob K 

Quite! If its heat you want, simply step out into the sun and cook yourself. You dont need 20c uppers to feel warm at this time of year if the sun is out. 


Far north of East Sussex. +150m asl.
Brian Gaze
30 June 2025 12:08:13

GFS has 26C on Wednesday , 27C on Thursday and 28C on Friday 

Originally Posted by: Rob K 

If we were currently in a cool and unsettled spell those of us of a certain vintage would be talking about it turning very warm later this week. 


Brian Gaze

Berkhamsted

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"I'm not socialist, I know that. I don't believe in sharing my money." - Gary Numan

GezM
  • GezM
  • Advanced Member
30 June 2025 12:16:26

As Brian noted above, the cooldown this week is looking less cool.

GFS has 26C on Wednesday , 27C on Thursday and 28C on Friday before it freshens up at the weekend, with Sunday barely making it out of the teens. 

Originally Posted by: Rob K 

We have an annual family bbq at our house sometime in July or August depending on people's availability - usually arranged a couple of months in advance. We seem to have developed a knack of choosing one of the worst days of the summer on most occasions - frequently resulting in us all being crammed indoors to avoid the cold and rain. This year is July 5th and it looks like the trend will continue. Just hoping that the GFS 6Z is a bit closer to the mark than some of the other very showery forecasts on offer. 


Living in St Albans, Herts (116m asl)

Working at Luton Airport, Beds (160m asl)

Rob K
30 June 2025 13:05:18

P15 is a fun one on the GEFS.


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

warrenb
30 June 2025 13:54:47

If GFS 6z is anything to go by, then we have a warm blip before the heat ramps up again


Taylor1740
30 June 2025 15:32:49

If GFS 6z is anything to go by, then we have a warm blip before the heat ramps up again

Originally Posted by: warrenb 

Let's hope not, would be more than happy to have an extended fresher spell.


NW Leeds - 150m amsl
Retron
30 June 2025 16:17:58

And this is where confusion arises. What defines  hot, warm, cooler, cool and mild?

Originally Posted by: TheJudge 

The Met Office does, and have done for years. The definitions used to be in degrees Fahrenheit, but are now in Celsius. They used to publish them on their website but for some reason they removed them many years back.

In summer (May to September), the definitions are:

Very hot: 8C or more above average

Hot: 6C or 7C above

Very warm: 4C or 5C above

Warm: 2C or 3C above

Average 1C below, average or 1C above

Rather cool: 2C or 3C below

Cool: 4C or 5C below

Very cool: 6C or more below

These are in reference to the latest 30-year period, so locally to me 26C in mid-June would have been hot in 61-90, but it's only very warm these days.

Note that cool (as opposed to rather cool) would mean highs of 17C in London, or 16C in Kent, 14C in Rochdale and 13C in Edinburgh in mid-June. You can add a degree to those figures for the end of June/start of July.


Leysdown, north Kent
Rob K
30 June 2025 16:23:10
Arpege 12Z update has flipped hotter again for tomorrow, with 36C in the London area.

GFS 12Z also has a 36C, but further into Kent.

GFS takes a cooler route after the end of the week though - an 8-9C drop from Friday to Saturday!


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

tierradelfuego
30 June 2025 17:14:23

The Met Office does, and have done for years. The definitions used to be in degrees Fahrenheit, but are now in Celsius. They used to publish them on their website but for some reason they removed them many years back.

In summer (May to September), the definitions are:

Very hot: 8C or more above average

Hot: 6C or 7C above

Very warm: 4C or 5C above

Warm: 2C or 3C above

Average 1C below, average or 1C above

Rather cool: 2C or 3C below

Cool: 4C or 5C below

Very cool: 6C or more below

These are in reference to the latest 30-year period, so locally to me 26C in mid-June would have been hot in 61-90, but it's only very warm these days.

Note that cool (as opposed to rather cool) would mean highs of 17C in London, or 16C in Kent, 14C in Rochdale and 13C in Edinburgh in mid-June. You can add a degree to those figures for the end of June/start of July.

Originally Posted by: Retron 

The other less scientific term outside of those definitions we use is "Mild". Over here in the UK I would say we always use it to mean it will get warmer from a relative cold spell or temp, so generally Winter but not always.

I have often noticed (vaguely interestingly), given my wife is from Oz so we go over every year, that they use it for the exact opposite, i.e. to signify temps moderating or becoming cooler from the present... not sure how other English speaking countries use the term though.


Bucklebury

West Berkshire Downs AONB

135m ASL

VP2 with daytime FARS

Rainfall collector separated at ground level

Anemometer separated above roof level

WeatherLink Live (Byles Green Crew )

Retron
30 June 2025 17:18:40

The other less scientific term outside of those definitions we use is "Mild". Over here in the UK I would say we always use it to mean it will get warmer from a relative cold spell or temp, so generally Winter but not always.

I have often noticed, given my wife is from Oz so we go over every year, that they use it for the exact opposite, i.e. to signify temps moderating or becoming cooler from the present... not sure how other English speaking countries use the term though.

Originally Posted by: tierradelfuego 

"Mild" was only to be used in winter - mid-November to mid-March - and has the same definition as "warm" in summer. "Hot" and "Very hot" are both replaced by "Exceptionally mild". 


Leysdown, north Kent
Rob K
30 June 2025 17:37:37

A phrase Brian used the other day was "all roads lead to Rome" and it is looking that way - whatever happens in the medium term the GFS, at least, wants to bring heat back. 12Z is yet another run with mid 30s before the end.


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

bledur
30 June 2025 17:55:50

Let's hope not, would be more than happy to have an extended fresher spell.

Originally Posted by: Taylor1740 

Yes it would be nice to have some average British Summer weather . Cannot see the attraction in scorching sun and dried up grass and heat induced irratability.

tierradelfuego
30 June 2025 17:58:25

"Mild" was only to be used in winter - mid-November to mid-March - and has the same definition as "warm" in summer. "Hot" and "Very hot" are both replaced by "Exceptionally mild". 

Originally Posted by: Retron 

Yes I agree that is our use, interesting how that is not universal


Bucklebury

West Berkshire Downs AONB

135m ASL

VP2 with daytime FARS

Rainfall collector separated at ground level

Anemometer separated above roof level

WeatherLink Live (Byles Green Crew )

Rob K
30 June 2025 19:02:43

FWIW the mean max temperature in the south on the GEFS 12Z ensemble set is 27-28C every day from about July 10th. That's an amazingly strong signal for a return to heat, that far out.


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

Hungry Tiger
30 June 2025 19:06:19

FWIW the mean max temperature in the south on the GEFS 12Z ensemble set is 27-28C every day from about July 10th. That's an amazingly strong signal for a return to heat, that far out.

Originally Posted by: Rob K 

This hot weather is definitely not over. I reckon there's another 4 hot spells before the end of August and I reckon there maybe another 2 or 3 in September and October.  🙂🙂🙃


Gavin S. FRmetS.

TWO Moderator.

Contact the TWO team - [email protected]

South Cambridgeshire. 93 metres or 302.25 feet ASL.



Ally Pally Snowman
30 June 2025 19:21:01

Ecm 12z turns very settled ,significant heatwave by the end.  


Bishop's Stortford 85m ASL.

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