Meteolux advises everyone to stay hydrated as red alert warnings forecast temperatures of 40 oC and above over the next two days.
Meteolux has put the country on red alert starting at 1 pm on Wednesday.
With temperatures set to reach as high as 42oC, Meteolux has issued extreme heat warnings for the south of the grand duchy on Wednesday afternoon, extending to the entire country on Thursday.
Temperatures between 36 and 40oC are likely along the Moselle, in the centre of the country and along the southern border, the meteorological office says.
It advises avoiding going out in the sun on Wednesday between 11am and 9pm and keeping blinds and shutters closed. Regularly drinking water, at least 1.5 litres per day, to stay hydrated and even moistening the skin by using an atomiser or taking a shower is also advised. People should also avoid physical exertion and seek air-conditioned spaces, like supermarkets or the cinema.
Thursday’s warning forecasts temperatures of between 38 and 40oC for the whole of the grand duchy, with extremes of up to 42oC possible along the Moselle and the south of the country.