The best time to visit Lupeni, for pleasant weather and outdoor activities, is during the summer months, from June to August.During this period, the weather is generally warm and sunny, with average temperatures ranging from 20°C to 25°C. This makes it ideal for exploring the surrounding Retezat Mountains, hiking, or simply enjoying the natural beauty of the Jiu Valley. Families travelling with children will find the summer a great time for outdoor adventures and exploring the local parks.For those interested in winter sports, the period from December to March offers excellent conditions for skiing and snowboarding at the nearby Straja resort. The mountains are typically covered in snow, and the resort provides various slopes for all skill levels.