Best Period to Go: The best time to visit Luxembourg is during the spring time as there are blooming flowers everywhere. Moreover, it is also the time for cultural festivals and for other celebrations. Winter season are considered to be too cold and bleak, so it is advisable not to visit the city at this time of the city. The city has a moderate climate and has less rainfall. The in season in the city is from mid April to mid October. The peak time is July and August.