The best time to visit Thornbury is during the late spring and summer months, particularly from May to September.During this period, the weather is generally warmer and drier, making it ideal for exploring the Thornbury Castle grounds, walking along the River Severn, or enjoying the local footpaths. You'll find the gardens at their most colourful, and there are often local events and festivals taking place.For couples looking for a romantic getaway, these months offer pleasant evenings for dining al fresco or enjoying a drink at a pub garden. The longer daylight hours also allow for more relaxed sightseeing.Families might also appreciate the summer months, as the good weather makes outdoor activities more enjoyable, and local attractions are typically in full swing.