average temperature in Luxembourg in May
Luxembourg: Annual Weather Averages. July is the hottest month in Luxembourg with an average temperature of 18Â°C (64Â°F) and the coldest is January at 0Â°C (32Â°F) with the most daily sunshine hours at 14 in June.The wettest month is June with an average of 100mm of rain.uxembourg: Annual Weather Averages. July is the hottest month in Luxembourg with an average temperature of 18Â°C (64Â°F) and the coldest is January at 0Â°C (32Â°F) with the most daily sunshine hours at 14 in June.