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The Belem Tower can get quite crowded, especially during weekends and even the summer months of the year. We recommend avoiding weekends and public holidays. It is best to visit during the weekdays to avoid all the rush and have a peaceful tour.
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For sunshine and warm weather, Lisbon's peak tourist season is June to September. Expect crowds at the Belém Tower, but also enjoy festivals and a lively atmosphere.
If you prefer fewer crowds and pleasant weather, aim for the shoulder seasons of April-May or September-October. You'll still get sunshine without the peak summer throngs.
For the absolute quietest experience, visit the Belém Tower during the low season, November to February. The weather can be cooler and wetter, but you'll practically have the place to yourself.