Brit Award-winning band Bastille's song Pompeii has been streamed more than any other track in the UK, with more than 26 million plays.
Asked about the news music streaming will be included in the Official Singles Chart, Bastille frontman Dan Smith said, "I think for the charts to be fair it has to reflect how people digest music."
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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.