Fears that consumers are reining in their spending ahead of Christmas were fuelled after it emerged that sales volumes from November failed to increase from October.
The quantity of goods bought in November 2012 has increased by 0.9% when compared to November 2011.
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Temperatures will reach around 28 Celsius (82F) at their highest.
A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.
New research has found those who consumed two cups had a 35% reduced risk, and for those who drank five cups, the risk halved.