The best time to visit Merrill, Wisconsin, is during the summer months, from June to August, or in the fall, from September to October.Summer in Merrill offers pleasant weather, with average temperatures ranging from the low 70s to low 80s Fahrenheit. This season is ideal for enjoying the area's many outdoor activities, such as boating and fishing on the Wisconsin River, exploring the numerous hiking and biking trails, or visiting local parks. Families will find plenty to do, from picnics by the water to engaging in water sports.For those who appreciate scenic beauty and cooler temperatures, the fall is an excellent choice. The surrounding forests display stunning autumn foliage, making it superb for picturesque drives and nature walks.