The best time to go to Blackwood is during the late spring and summer months, from May to September.During this period, Blackwood and the surrounding Welsh Valleys experience their mildest weather, with warmer temperatures and less rainfall, making it ideal for outdoor activities and exploring the local area. The days are longer, providing ample daylight for sightseeing.For those who enjoy walking or cycling, June, July, and August offer the most pleasant conditions for exploring the Sirhowy Valley Country Park or the many trails in the vicinity. The local markets and outdoor events are also more frequent during these months.If you prefer to avoid the peak summer crowds but still want decent weather, May and September are excellent choices.