Kenyan police say Somalia's Al-Shabaab Islamist group is most likely to blame for Sunday night's assault on the town of Mpeketoni.
There has been no immediate claim of responsibility for the attacks, in which at least 48 men were killed.
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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.