The weather in Luxembourg is marked by a moderate, temperate climate, with minimal experiences of extreme conditions. Winters can get cold, while summers tend to be mild. You can expect pleasant temperatures of between 57ºF (14ºC) and 66ºF (19ºC) in the summer (June to September). That said, brief periods of hot weather occur more regularly nowadays, sometimes climbing as high as 86ºF (30ºC).
From December to March, winter temperatures generally hover above freezing, apart from during the coldest month of January, when it regularly drops below 32ºF (0ºC). Although infrequently, Luxembourg has recorded lows of 5ºF (-15ºC) over the past two decades.
Although winter tends to bring more wet weather and windy conditions, rain is common and plentiful throughout the year in Luxembourg. That said, summer days can bring afternoon thunderstorms, although this does not occur regularly. Cloud cover is quite common, even on dry days. The warmer months generally get around 7 hours of sunshine per day, though, with July averaging 10 hours of sun a day.