high season: mid-June to mid--September
low season: January to March, November
shoulder season: April to mid--June, mid-September to October, December
Weather InformationLuxembourg has a temperate climate without extreme hot or cold weather. Daily temperatures average in the low 70s during the summer and the low 40s during the winter. The weather is warm and dry from mid-June through mid-September and gray November through March.
Crowd InformationLuxembourg sees more crowds July through August.
Closure InformationHotels, shops, and other venues can close down or offer limited access November through March, then reopen in April.
When to SaveThe most expensive time to go is July through August, while the cheapest months are January, February, and November. The best time to go to save money and experience pleasant weather is May through June and September through October.
When to BookIn general, Luxembourg has no direct flights to/from the U.S. or Canada, and it can be very difficult to know when to book. However, as for most flights to Europe, it's generally a good idea to book at least six months in advance for travel during the high season. For hotels, B&Bs, villa rentals, and campsites, book at least six months in advance during the high season and three months in advance for the shoulder season. Booking at the last minute is viable for low season travel, but it's best to make reservations at least one week in advance.
Information provided by the Luxembourg National Tourist Office