August 1991 was a good summer month but its virtually forgotten. No outstanding high maxima but consistently warm.
CET: 17.1 (+1.3)
England and Wales rainfall: 27.8mm (10th driest on record)
Sunshine: 208.9hrs (121%)
Scotland
Temp: 14.0 (warmest since 1984)
Sunshine: 141.3hrs (sunniest since 1984)
Rainfall: 61.6mm (driest since 1984)
Northern Ireland
Temp: 15.0 (1990 was slightly warmer)
Sunshine: 151.8hrs (sunniest since 1977)
Rainfall: 38.4mm (driest since 1983)
For Wick, it was the warmest August since 1947
Leuchars, the sunniest August since 1976.
Hastings recorded only 3mm of rainfall with 147% of the expected sunshine.
Maximum temperatures were nothing special, the highest maximum at Manchester Airport was just 26.6C on the 31st but 20+C was recorded on 21 days.
Heathrow recorded 27.9C on the 21st with only 1 day being sub 20C for the whole month.
The good spell continued into the early part of September with Heathrow recording 29.7C on the 1st of September.
1st August-10th September CET: 17.0
England and Wales rainfall 1st August-13th September: 28.3mm
So it was a very pleasant month.
MANCHESTER SUMMER INDEX for 2021: 238
Timelapses, old weather forecasts and natural phenomena videos can be seen on this site
http://www.youtube.com/channel/UCgrSD1BwFz2feWDTydhpEhQ/playlists