On Monday 10 July 2023, Luxembourg's weather portal MeteoLux announced weather warnings in relation to high temperatures on Tuesday 11 July 2023.

An orange heat alert ("danger") is in place for southern Luxembourg from 10:00 to 20:00. Maximum temperatures are expected to reach between 32°C and 35°C in the south of the country and may (locally) exceed 35°C in the Moselle valley and in urban areas.

Similarly, MeteoLux has issued a yellow alert ("potential danger") for the north of Luxembourg on Tuesday between 10:00 and 20:00. Maximum temperatures are expected to reach between 30°C and 33°C.