August 1991 was a very good summer month.

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.

Highest temp all month was only 26C but it was consistently warm. Very little rain - only 11mm.

September 1991 was good too. Warmer then June that year - but considering how diabolical June 1991 was, that wasn't exactly hard.

The best of the weather was in the later part of the month and this continued into September.

Correct me if i'm wrong, but wasn't September the sunniest month of the year in 1991 in NW England.  Probably unusual considering the shorter days that time of year.

The month was consistently warm here but apart from a Saturday around the tenth or eleventh I think (28C) all the hot weather came in the last week. Topped 25 for the last 6 days, & I spent the entire week river swimming. 3 of those 6 were above 27 (31st reached 28.7C in Mayflower Park) and we went on to enjoy 3 consecutive 27C+ from 3rd-5th Sep. I remember the conkers were massive that year.