Deyan Deyanov, 29, has been found guilty by a jury at the Provincial Court in Santa Cruz de Tenerife, Spain, of murdering grandmother Jennifer Mills-Westley, 60, who he decapitated on the holiday island in May 2011.
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Robert Gropel asked his wife to wait while he hiked to the peak, not realising she had altitude sickness that would prove fatal.
Severe weather warnings have been issued as up to 60mm of rain is set to fall within just a few hours in some parts.
Tuesday: A cloudy, cool and dull day with outbreaks of heavy rain becoming lighter and patchier.