The best time to visit Union, South Carolina, is during the spring (April to June) and fall (September to October) when the weather is most pleasant for outdoor activities and exploring.During these months, you'll experience comfortable temperatures, typically ranging from the mid-60s to high 70s Fahrenheit, with less humidity than the summer. This makes it ideal for enjoying local parks, visiting historic sites, or attending community events without the discomfort of extreme heat. Travelers looking for a relaxing trip with good weather for sightseeing will find these seasons most appealing.Summer (July and August) can be quite hot and humid, with temperatures often reaching into the 90s, while winter (November to March) brings cooler temperatures, sometimes dropping to the 30s.