As the Met Office issues a 'level 3' health warning in the south east of England, temperatures are expected to soar across the UK.
While we all know we need to take care in the heat, here are five unusual and surprising things you might not have known about the rising temperatures.
- Heat degrades your mobile phone battery
Keeping your phone cool and out of the sun will mean your battery lasts longer as the heat affects the rate at which power is used.
A range of 0C - 35C is best for iPhones according to Apple.
- Open car windows burn more petrol
Open windows can increase drag and will cause cars to burn more petrol when driving fast. It is better to use air conditioning if you have it on motorways and faster roads.
- Cucumbers really are cool
"As cool as cucumber" is not just a phrase as the inside of the fruit can be up to 11C cooler than the ambient temperature.
- UK motorways are built to withstand temperatures of up to 60C
The Highways Agency does not build or maintain all the roads in the UK but the main roads and motorways it is responsible for are made to operate between temperatures from -15C up to highs of 60C.
- Hot water can freeze faster than cold water
The 'Mpemba effect' is the name given the phenomenon where warm water freezes faster than cold. Although well documented there is still no definite theory on why this happens.
Earlier this year the Royal Society for Chemistry launched a competition to find, "the best and most creative explanation of the phenomenon by which hot water sometimes freezes faster than cold water."