Summer in Switzerland can be fairly rainy but the humidity is usually low and the air is clear. Most of the days in this range are warm and sunny. Although make sure to bring clothes in order to dress in layers if necessary because there might be cooler days even during summer. One of the best things about summer is that the Alps are lush and picturesque with thousands of possibilities for hiking.
Some mountain lakes with refreshing water are great for swimming at this time. Most of the cultural and art events in Switzerland take place between June and August so you definitely won’t be bored.