The best time to go to Poupehan is during the late spring (May-June) and early autumn (September-October) for pleasant weather and fewer crowds.During these months, the temperatures are mild and comfortable, making it ideal for outdoor activities like hiking, cycling, and exploring the Semois Valley. The natural scenery is particularly beautiful, with wildflowers blooming in spring and vibrant foliage in autumn. These periods also generally avoid the peak tourist rush of summer, offering a more tranquil experience.For travelers who enjoy water sports and warmer weather, the summer months of July and August are also a good option. The Semois River is superb for kayaking and swimming during this time, and many local events and festivals take place.