The record has stood since 1944, but temperatures on Monday could reach as high as 35C, according to BBC Weather.
Javascript is required for you to be able to read premium content. Please enable it in your browser settings.
The prospect of comfortably beating the current record (32.8C) is "bonkers", according to BBC Weather's Simon King.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results