The Met Office warns that Scotland's highest recorded temperature of 32.9C could be topped.
The highest temperature recorded in Scotland was 32.9C at Greycrook in the Borders in August 2003.
Adam Stachura, head of policy for Age Scotland, told the BBC that people can be "easily caught out" by a rapid rise in temperature. "The really helpful thing to do is to check in on your older friends and relatives, when it is stifling heat like this then they might not be coping so it is important to check on them."
Scottish Water has requested that people help maintain normal supplies by being as efficient as possible with water use.
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