Pretty sure the record is 3 days which has happened three times.
June 25/26/27 1976 had 35.4, 35.5, 35.6.
August 2/3/4 1990 had 36.6, 37.1, 36.1 - surely the hottest three day period ever?
August 10/11/12 2020 had 35.5, 35.7, 35.4 (and had six consecutive days over 34C, from the 7th to the 12th).
BTW Southampton Oceanographic Centre had a high of 37.1 today (but not official).
Originally Posted by: Rob K