Summer 1826: 2nd warmest on record with a CET of 17.6, interestingly late June and early July also had a notable heatwave like in 1976. (26th Jun-7th Jul 1826: 20.72C) 
Summer 1826: 10th driest on record.

CET
Jun: 17.3
Jul: 17.9
Aug: 17.6

Temperatures at Tottenham

June
1 64f, 51f
2 62f, 47f
3 70f, 42f
4 70f, 52f
5 72f, 45f
6 76f, 54f
7 68f, 52f
8 74f, 50f
9 76f, 50f
10 80f, 52f
11 81f, 50f
12 88f, 52f
13 88f, 53f
14 82f, 56f
15 83f, 49f
16 75f, 45f
17 75f, 55f
18 83f, 48f
19 76f, 45f
20 75f, 43f
21 68f, 53f
22 75f, 48f
23 80f, 45f
24 84f, 45f
25 85f, 47f
26 88f, 57f
27 92f, 62f
28 91f, 58f
29 82f, 58f
30 87f, 62f
July
1 81f, 56f
2 88f, 52f
3 89f, 52f
4 86f, 60f
5 87f, 58f
6 87f, 66f
7 85f, 62f
8 83f, 64f
9 83f, 54f
10 80f, 56f
11 78f, 62f
12 78f, 64f
13 75f, 55f
14 78f, 60f
15 75f, 54f
16 73f, 49f
17 79f, 51f
18 78f, 58f
19 74f, 54f
20 72f, 59f
21 73f, 49f
22 74f, 50f
23 76f, 54f
24 70f, 55f
25 78f, 47f
26 71f, 44f
27 74f, 50f
28 78f, 46f
29 79f, 49f
30 86f, 52f
31 89f, 59f
August
1 85f, 62f
2 81f, 61f
3 81f, 60f
4 77f, 59f
5 74f, 50f
6 77f, 56f
7 78f, 59f
8 85f, 55f
9 81f, 59f
10 80f, 55f
11 66f, 48f
12 71f, 46f
13 78f, 46f
14 80f, 50f
15 75f, 52f
16 73f, 51f
17 74f, 60f
18 81f, 52f
19 84f, 52f
20 88f, 57f
21 77f, 57f
22 79f, 57f
23 76f, 58f
24 76f, 58f
25 80f, 60f
26 74f, 54f
27 73f, 50f
28 78f, 64f
29 80f, 58f
30 78f, 56f
31 75f, 57f

Weather observations
June
1st Night rainy
2nd Cloudy
3-26th Fine
27th Sultry, a thunderstorm from eleven to one.
28th Fine, sultry
29-30th Fine

July
1st-7th Fine
8th Fine day, evening showery
9-11th Fine
12-14th Cloudy
15th Fine
16th Morning cloudy, afternoon fine
17-19th Fine
20-21st Showery
22nd Very rainy night
23rd Rainy day
24-29th Fine
30th sultry
31st Thunderstorm at 10am

August
1st Sultry
2nd Fine
3 Overcast, a heavy storm at midnight
4 Rainy night
5-8th Fine
9th Fine, some rain at night
10th Fine
11th Rainy
12-19th Fine
20th Sultry
21st-22nd Fine
23rd Cloudy
24th Fine
25th Fine day, sky became suddenly overcast about 7pm and a violent storm followed accompanied with incessant lightning for two or three hours.
26th-31st Fine

June 1826

Liverpool: We have not had any rain since early part of March: the drought has caused great consternation for many miles round this town. The want of water for the cattle and domestic purposes is most severely felt. The fields, which used at this season of the year to wear their luxurant green, have at present the colour of high roads. A similiar complaint, we learn, prevails at Leicester, where no rain has fallen since Easter.
Public Ledger

---

The heat has been excessive for some time. The thermometer has frequently benn at 84F in the shade and at 125F in the open air. The consequences are alarming. The mosses and and heath-clad muirs to the SW have been on fire for a week past and are still burning.
Glasgow Courier

---

The drought with which we have been visited for the last two months still continues. In the early part of the last week we had cool breezes from the east, but on Saturday the wind veered to the west, in which quarter it continues. The heat on Saturday and yesterday was quite oppressive, the thermometer in the shade on both days being as high as 82F. Most of the rivulets are dried up and the rivers wanting so many of their tributary streams, the grain mills and other public works on their banks, are either stopped or working only a few hours a day. The wells and ponds about country houses are, in many places, dried up, and the farmers are under the necessity of either carting water from a distance, or driving their flocks and heards to the distant streams.
Edinburgh
The barometer during June 1826 never fell below 1015mb after the 1st of that month.  

July

Aberdeen: The weather continues dry and sultry to a degree very unusual in this part of the country...The face of the country is parched and corns which till now had preserved a tolerably healthy appearance are becoming brown...The heat for the last few days has been most oppressive, the thermometer in the shade ranging from 75 to 82F. Many, wells, ponds and some of the small streams of water are entirely dried up.

Pembroke: Pembrokeshire and the adjoining counties have not witnessed such an extent of dry weather during recollection of the older inhabitants. Since 4th of March last but two showers have fallen, neither of which lasted more than three hours. The thermometer during the last week has been ranging from 78 to 83F in the shade. The excessive heat and drought has completely suspended vegetation, the grass lands are burnt brown....

Glasgow: The warmth during the last seven days has been higher than was ever previously known in this part of the country. The thermometer in Nelson street at 6 o'clock in the mroning, has on an average indicated 71F and near Rotherglen, at 3 o'clock, it stood as follows -- Monday 82F, Tuesday 84F, Wednesday 83F, Thursday 82F. The heat has had the effect of increasing the number of flies and giving continual vigour to gnats.

Croft of Glenmuir: All the trouts and eels in the hill burns have died and the people are gathering bags full of them.

Brechin: A desturctive fire has broken out on the hills in the parish of Strachan.

Chelmsford: It is now nearly 2 months since we have had any rain in this part of the county.

Leicester: The weather here is excessively hot and dry. The fields are parched up.

Bradford: Ilkley, Hawkesworth, Bingley, Burley, Thornton, Oaksworth, Ovendon, Home, Burnsall, Hebden and Grassington Moors on fire.

Worcester: The excessive drought which has prevailed so long is, we believe without a parallel since July 1785. Farmers are lopping trees to supply their cattle with food.

Manchester: Never, perhaps, was rain more universally welcomed by all ranks of people than that which fell here on Tuesday evening. It was received in the lap of the earth as the richest gift of Heaven and the evils which the people breathing with difficulty the almost tropical atmosphere were prognosticating in the shape of pestilence and famine, seemed to vanish at once as the lungs played more freely, feeling the immediate influence of the cooled air. On this change of the weather most heartily do we congratulate our readers.

Thats without UHI effect either, I dread to think of how muggy those nights in early July would have been if London had the infrastructure it had now back then

Thanks Kevin. A very interesting post.

What's also impressive are the differences in temperature between night & day, particularly the period 22-25 June. It's dropping to 6-7C at night but going up to nearly 30C during the day. Shows how dry the air was.

One day we'll have another summer like that...

A dream summer that is - 3 months with weather very like in 1976.

A once in 150 year experience so it seems.

 

What was winter 1826-27 like, and was the contrast between summer 1826 and 1827 as great as the one between 1976 and 1977?