The father of British teenager Hannah Smith, who took her own life after allegedly being bullied online, said it was "scary" he was not surprised by a survey that suggested 69% of young people have been cyberbullied.
Dave Smith said he was expecting the figures "to be a little bit higher".
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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.