A neighbour has claimed Isidro Garcia "was always watching" his captor from a window whenever she left the house.
Maribel Garcia said it appeared that the woman - who was kidnapped by the 41-year-old 10 years ago - "knew she had to do what he said".
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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.