This is particularly important for the elderly, young children and babies, whose bodies cannot always regulate temperature changes efficiently leading to heat stress.
If you work outside or are not used to the heat, you may also be at a higher risk.
Heat-related illnesses range from mild symptoms such as a rash or cramps, to very serious conditions such as heat stroke.
Effects can also build up over several days and can worsen heart disease and other chronic problems.
If you experience severe symptoms – such as dry red hot skin, high body temperature, nausea, and rapid heart rate – seek urgent medical advice.
Never leave anyone in a closed car, including pets, even briefly. The temperature inside a car can rise to more than 60 °C in just a few minutes.
Don't rely on fans unless there is adequate ventilation.