The best time to go to Velamazan is during the spring (April to June) and autumn (September to October) months, when the weather is most pleasant for exploring the region.
Spring brings mild temperatures and the countryside bursts into bloom, making it ideal for outdoor activities like hiking and cycling through the Soria province. You'll find comfortable conditions for visiting the nearby Romanesque churches and archaeological sites without the intense heat of summer.
Autumn offers similarly agreeable weather, with cooler temperatures and beautiful changing foliage. This period is great for enjoying the local gastronomy, including mushroom foraging which is popular in the region. The harvest season also means you might encounter local festivals and traditions, providing a deeper insight into the local culture.
While summer (July and August) can be warm, it's a good option if you plan to combine your trip with visits to nearby natural swimming spots or simply enjoy the longer daylight hours. However, be prepared for hotter afternoons, especially in August.