Tomorrow will be average, yes. The 29 that Tim is enthusing about isn't average, far from it, and will be especially unpleasant to be out and about in. (And yes, I speak from experience - it was 25 when I went four weeks ago and that was enough for the Jubilee line carriage I was on to stink of BO, and the bus back from Kew was especially putrid inside - steamy, and it stank of BO and stale piss. 29 would be even worse.)

London's transport isn't designed for hot weather, other countries where it's hotter (like Japan, or the south/SW in the States) cope much better with it all!

It won't be as bad as last summer, 12 days in Florence/Tuscany with temps over 40c on half the days (and just under on the others) and no air con for most of the trip. 

Until now they refused to put ac in buses even with cooler climate now we having it still hot inside any vehicle like all cars have ac is a must.

Disappointing but not surprising 

Reality sunny to sunny spells at some point daily, no rain or snow, temps resulted higher by 2 to 3C and frosty nights well below -4 or more as proof of deep frosts on surfaces as -1 is slight frost patches.   I know very well on frostiness thickness from temps I used to record it.

Same applied to Nicosia and Furnace creek also well under cook both day and night temps.  

I suspect we might be less lucky in Cornwall from the 17th though.

Very consistently I find this tends to happen around the midway point of August, regardless of the weather, and this year is no different.

It's funny how one's subconscious mindset drifts over time.

Back in school, this week would have been one of the two middle-weeks of the school summer holidays, and I remember always thinking of summer as a July-August event. When I started working, I sort of gradually drifted away from that. When our kids were younger, you drift back.

It's later down here - around the 20th, or a couple of days later, but I know exactly what you mean. The sun loses its "kick" and from then on the changes happen much more quickly. It's now pretty dark in the morning when I get up too (I've noticed in the last few days that we've gone from a couple of just the brightest stars to lots more).

It still feels like high summer here but even then it looks a little autumnal due to the lack of rain: more trees are shedding leaves and the grass is increasingly turning to straw, leaving just the clover and dandelions etc behind!

Conversely the opposite happens in the middle of February down here - that's when the sun starts to get a kick to it, even if it's mild compared to the searing heat of midsummer.

Yes, I was thinking exactly the same thing today. The June/July intensity of the sun has gone. The exact converse of what happens in mid Feb when the sun is noticeably higher in the sky and begins to feel warm on your face. As someone who leaves for work at 4.45am every day it's the mornings getting darker that I notice. Around the solstice I leave in broad daylight but now there's just a glimmer of light in the east and soon that will be gone too.

You're an early bird like me, then - the thing that always catches me out is how rapid that early morning change is this time of year!

The mid Feb/mid-late Aug switch is interesting too, as it doesn't really make sense, even though you've also noticed it.

Here, for example, around the 20th August the sun is still 51 degrees high in the sky, 11 degrees below the June maximum. Two weeks after that, early September, it'll only be 46 degrees high... but that's still way more than in late February, when it's only 26 degrees high!

I guess it's the rate of change we're picking up on in both cases. Following a long period where the sun's intensity has been much the same, be it winter or summer, we notice it more...

It's around the 20th here, although having been out in the garden at lunchtime, even though it was solar noon, the sun lacked the usual punchy hot feeling... it just felt warm rather than hot. Temperature wise it's the same as the past few days, but the humidity is much lower today and I'd imagine that's part of it.

Not long until it feels warm all the time, mind you, no matter what the humidity may be.

Feels positively chilly today.

Same here very chilly gale force winds and closed all the air vents yesterday to keep my home warm enough at 24 to 25C. Too much unexpected clouds today and yesterday after very poor forecast for a nice weekend.  

Can’t wait to exit this so very poor summer weather out soon enough with rating 0/10 which followed by very cold poor Spring. 

Mind you, I agree with Jiries - I can't wait for this summer to be over, and indeed it's turned very poor indeed over the past four weeks. The best bits? The first half of June and the first half of July. Since then it's been utter dross...

I am off 18 days fixed vacation from 2nd to 19th September so I am so hoping to see decent wall to wall sunshine days and warm temps.

I know you don't like high temps but why we can't get full sunshine in any temps of 18-20C in summer instead of compulsory over cast days like today.  At least in September or October we get sunny days with high teens temps or low 20's.

The smoke nonsense is not true that can block the sun completely all day, they are just making up excuses after their failed sunny forecasts last weekend back up with complaints in NW forum posters.  If was smoke it would not block the sun at all but still sunny and slight hazy skies but what I see it nasty clouds and clear skies overnight follow by cloudy day again, If was smoke then it would not be perfectly timed clear away at sunset to sunrise.  It all pack of lies from the media and can't have smoke travelled over 3000 miles exclusively to the UK to block the sun?