Valle Verzasaca and Valle Maggia are well known and popular for river diving. We had been there several times at different months.
Valle Verzasca is a beautiful valley and impressive throughout the year. If you like to come here for swimming, diving or snorkeling the season starts in May until October. The mountain river is pretty cold and a wetsuit is necessary to stay in the river for a while. The water temp is more bearable in August/ September. Best light from 10 a.m. until 2 p.m. If you arrive afterward the rock garden is less impressive without any sunshine into the river.
Peak season and utterly crowded in July and August. Our preferred month is September, fewer crowds and less cold. Avoid the crowds at weekends.
Check the weather forecast first; sometimes flood waves can happen. Weather Forecast